Term
Which of the following would NOT be an area of study in life science?
a. studying how lions and hyenas interact
b.measuring the rate at which bacteria divide
c.comparing the reproduction of arctic plants with that of desert plants
d.studying how volcanoes are formed |
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Definition
| d. studying how volcanoes are formed |
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Term
The steps of the scientific method
a. must all be used in every scientific investigation.
b. must always be used in the same order.
c. are not always used in order.
d. start with the development of a theory. |
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Definition
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Term
In a controlled experiment,
a. a control group is compared with one or more experimental groups.
b. there are at least two variables.
c. all factors should be different.
d. a variable is not needed. |
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Definition
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Term
When a scientist finds that a hypothesis is wrong, the scientist usually
a. tries to find another explanation for what has been observed.
b. stops studying science.
c. feels that nothing valuable was learned.
d. adds an additional variable to his or her experiment. |
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Definition
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Term
What tool would a life scientist use to get a three-dimensional image of a microscopic organism?
a. CT scan c. scanning electron microscope
b. X ray d. magnifying lens |
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Definition
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Term
The International System of Units
a. is based on standardized body measurements.
b. contains units that are based on the number 10.
c. is useful only for measuring lengths.
d. is a device used to measure volume. |
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Definition
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Term
In which of the following areas of study might you find a life scientist at work?
a. discovering ways to improve computer-operated robots
b. studying how wasps could be used to control fire ant populations
c. studying the relationship between El Niño and increased flooding
d. researching the paths of comets and meteors in space |
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Definition
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Term
When researchers use the scientific method, they should
a. repeat or switch the order of steps as needed.
b. ignore results that contradict well-established theories.
c. try to study as few subjects or individuals as possible.
d. find the answers to complex questions very quickly. |
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Definition
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Term
A scientist who wants to study the possible side effects of a new medicine would probably
a. give each experimental group the same dose of medicine.
b. simply ask the subjects about the medicine's effects.
c. include a control group that received no medicine.
d. use different numbers of subjects in each treatment group. |
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Definition
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Term
Which tool would a life scientist use to obtain a detailed image of the nerves that branch off a person's spinal cord?
a. a scanning electron microscope c. a transmission electron microscope
b. an X ray d. an MRI |
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Definition
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Term
An advantage of using the International System of Units is that it
a. is based on measurements of common body parts.
b. includes easily understood units of measure, such as inches.
c. gives scientists a common way to share their results.
d. uses different units to measure mass and weight. |
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Definition
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Term
In a scientific experiment, a hypothesis that cannot be tested is always considered to be
a. incorrect. c. not useful.
b. illogical. d. a theory. |
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Definition
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Term
A ____ object contains the same amount of matter as a 10 kg object.
a. 100 g c. 1,000 g
b. 10,000 g d. 100,000 g |
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Definition
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Term
____ are usually stated in an "If . . . then . . ." format.
a. Hypotheses c. Theories
b. Predictions d. Variables |
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Definition
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Term
After forming a hypothesis, you should
a. test your hypothesis. c. analyze the results.
b. ask a question. d. draw conclusions. |
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Definition
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Term
Analyzing the results of your experiment can be
a. obtaining data from your experiment.
b. organizing your data into tables and graphs.
c. doing calculations to learn more about your results.
d. Both (b) and (c) |
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Definition
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Term
After concluding that your tests support your hypothesis, you should
a. keep it secret so that no one steals your idea.
b. publish the results so that other scientists can learn from you.
c. wait around to see if anyone else discovers the same thing.
d. None of the above |
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Definition
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Term
Many environmental problems are caused by
a. wildlife going berserk.
b. the sun's natural disintegration of our atmosphere.
c. the natural evolution of our planet.
d. people's misuse and improper disposal of natural resources. |
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Definition
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Term
The first step in finding solutions to problems such as pollution, deforestation, and the extinction of wildlife is to
a. try as many experiments as possible until something works.
b. understand how we affect the world around us by making observations and asking questions.
c. create new species so we will not miss the old ones.
d. develop new technologies that will allow us to leave the planet and live someplace else. |
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Definition
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Term
To answer a question or solve a problem, scientists use
a. the scientific method. c. their creativity.
b. their imagination. d. All of the above |
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Definition
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Term
Which of the following statements is a hypothesis?
a. Deformed frogs have been found in the United States and Canada.
b. Insecticides and fertilizers caused the frog deformities.
c. Frogs can easily absorb pollutants through their skin.
d. Approximately fifty percent of the frogs observed were deformed. |
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Definition
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Term
A(n) ____ is a statement of cause and effect that can be used to set up a test for a hypothesis.
a. prediction c. conclusion
b. premonition d. observation |
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Definition
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Term
In order to be certain about the conclusions of an experiment, scientists should
a. keep the number of individuals in both the control group and the experimental group small.
b. do the experiment only once.
c. have many more individuals in the experimental group than in the control group.
d. have as many individuals as possible in both the control group and the experimental group, and repeat the same experiment many times. |
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Definition
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Term
An experiment is designed to test the effect of UV light on frogs. Which of the following groups would be the control group?
a. frogs not exposed to UV light c. frogs exposed to UV light for 24 days
b. frogs exposed to UV light for 15 days d. frogs kept in complete darkness |
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Definition
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Term
When scientists find that a hypothesis is not supported by the tests they perform, they realize that
a. the experiment was a waste of time.
b. they did the experiment wrong.
c. they have eliminated one possible factor.
d. they must perform the experiment again until it works out the way they think it should. |
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Definition
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Term
Dr. Brown found that 3 seeds kept at 30°C sprouted in 6, 5, and 4 days. What is the average number of days that it took these seeds to sprout?
a. 3 days c. 5 days
b. 4 days d. 6 days |
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Definition
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Term
In today's world, scientists form a global community. This means that
a. scientists live in a single country.
b. scientists work on the same topic.
c. each scientist works in isolation.
d. scientists share their results with other scientists. |
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Definition
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Term
The three main parts of a compound light microscope are
a. an ocular lens, an objective lens, and a hand lens.
b. a stage, a light, and a tube with lenses.
c. a lens, a slide, and a light.
d. an ocular light, an objective light, and a radiant light. |
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Definition
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Term
If you use a microscope to observe an object that is 0.2 mm long under 100 magnification, how large will the object appear to be?
a. 0.2 mm c. 20 mm
b. 2 mm d. 200 mm |
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Definition
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Term
You have a microscope that magnifies 500. The object you are looking at appears to be 25 mm long. How long is it really?
a. 0.05 mm c. 20 mm
b. 5 mm d. 25 mm |
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Definition
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Term
An object 0.01 mm appears to be 10 mm under a microscope. How much is the microscope magnifying the image?
a. 10 c. 1,000
b. 100 d. 10,000 |
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Definition
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Term
____ 33. Transmission electron microscopes can magnify specimens up to ____ times their actual size.
a. 100 c. 100,000
b. 1,000 d. 200,000 |
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Definition
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Term
Scanning electron microscopes can magnify specimens up to ____ times their actual size.
a. 100 c. 100,000
b. 1,000 d. 200,000 |
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Definition
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Term
If you want to look at the surface features of a paramecium, you would look at it using a
a. compound light microscope. c. scanning electron microscope.
b. transmission electron microscope. d. CT scan. |
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Definition
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Term
If you want to look at the surface features of a paramecium, you would look at it using a
a. compound light microscope. c. scanning electron microscope.
b. transmission electron microscope. d. CT scan. |
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Definition
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Term
A scanning electron microscope and a transmission electron microscope are similar in that they both
a. use electrons to magnify a specimen.
b. produce a three-dimensional image.
c. cause electrons to pass through the specimen.
d. All of the above |
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Definition
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Term
X rays are used to
a. view hard internal body structures such as bones.
b. view organs such as the heart and lungs.
c. learn about the structures of proteins.
d. All of the above |
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Definition
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Term
A CT scan is a
a. computed tomography scan. c. computer-generated topography scan.
b. clearly transferred scan. d. concentrated transmission scan. |
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Definition
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Term
MRI is an abbreviation for
a. magnetized resolution image. c. magically retrieved image.
b. magnetic resonance imaging. d. magnification resolution imaging. |
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Definition
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Term
In a CT scan, low-dosage ____ beams are passed through the body at different angles.
a. proton c. X-ray
b. laser d. electron |
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Definition
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Term
To produce an image, MRI uses short bursts of
a. X rays. c. a magnetic field.
b. electrons. d. a laser. |
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Definition
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Term
With CT scans and MRI, ____ used to display the image.
a. film is c. overhead projectors are
b. computers are d. None of the above |
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Definition
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Term
How many meters are in a kilometer?
a. 10 c. 1,000
b. 100 d. 10,000 |
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Definition
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Term
What does the prefix milli- mean?
a. c. 100
b. d. 1,000 |
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Definition
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Term
1 L is equal to
a. 1 cm3. c. 1,000 mL.
b. 0.01 m3. d. All of the above |
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Definition
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Term
The length of a microscopic object would most likely be expressed in
a. nanometers (nm). c. centimeters (cm).
b. millimeters (mm). d. decimeters (dm). |
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Definition
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Term
A 1 nm object can be seen with
a. the human eye. c. a compound light microscope.
b. a hand lens. d. an electron microscope. |
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Definition
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Term
An amoeba can be seen with
a. the human eye. c. a compound light microscope.
b. a hand lens. d. All of the above |
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Definition
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Term
The area of an object is calculated by
a. adding the length to the width. c. multiplying the length by the width.
b. subtracting the width from the length. d. dividing the length by the width. |
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Definition
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Term
What is the area of a square with sides measuring 5 meters?
a. 5 m2 c. 15 m2
b. 10 m2 d. 25 m2 |
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Definition
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Term
A rectangle has an area of 36 cm2 and a length of 9 cm. What does its width measure?
a. 9 cm c. 45 cm
b. 4 cm d. 324 cm |
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Definition
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Term
A microliter is ____ of a liter.
a. one-tenth c. one-thousandth
b. one-hundredth d. one-millionth |
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Definition
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Term
To measure the volume of a liquid, you would use a
a. ruler. c. thermometer.
b. graduated cylinder. d. balance. |
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Definition
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Term
To measure the volume of a block of wood, you would use a
a. ruler. c. thermometer.
b. graduated cylinder. d. balance. |
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Definition
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Term
You have a graduated cylinder that contains 50 mL of water. You drop a sea shell into the cylinder, and the water level rises to 65 mL. What is the volume of the sea shell?
a. 15 cm3 c. 50 cm3
b. 115 cm3 d. 65 cm3 |
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Definition
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Term
A metric ton equals
a. 1 kg c. 100 kg
b. 10 kg d. 1,000 kg |
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Definition
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|
Term
Mass is measured with a
a. spring scale. c. graduated cylinder.
b. balance. d. ruler. |
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Definition
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Term
A medium-sized apple has a mass of about
a. 100 mg. c. 100 kg.
b. 100 g. d. 100 metric tons. |
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Definition
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Term
A hippo's mass would most likely be described using
a. pounds. c. kilograms.
b. milligrams. d. kilometers. |
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Definition
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Term
When energy is transferred to an object, its ____ increases.
a. mass c. temperature
b. weight d. All of the above |
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Definition
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Term
The official SI units for temperature are
a. kelvins. c. degrees Celsius.
b. degrees Fahrenheit. d. All of the above |
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Definition
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|
Term
Normal body temperature is
a. 32°F. c. 37°C.
b. 32°C. d. 37°F. |
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Definition
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Term
The Empire State Building is 381,000,000 m tall. This measurement would more likely be expressed as
a. 381 mm. c. 381 m.
b. 381 cm. d. 381 km. |
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Definition
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Term
Which of the following is NOT one of the six steps of the scientific method?
a. ask a question c. draw conclusions
b. test a hypothesis d. none of the above |
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Definition
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Term
The students from Le Sueur, Minnesota, discovered that about half the frogs they observed at a wildlife refuge were deformed. During their investigation, the students
a. continued to observe the frogs. c. took measurements.
b. asked a question. d. All of the above |
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Definition
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Term
Henry wants to test the effects of different antibacterial soaps on the growth of bacteria. Which of the following should be the variable in his experiment?
a. the type of bacteria
b. the jars in which he places the bacteria and soap
c. the type of soap
d. the amount of soap |
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Definition
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Term
Scientists caught and measured five fish in a nearby lake. The lengths were 15 cm, 25 cm, 20 cm, 30 cm, and 35 cm. What was the average length of the fish?
a. 20 cm c. 25 cm
b. 23 cm d. 125 cm |
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Definition
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Term
With a compound light microscope, a specimen is placed under the lens and
a. light passes through the specimen. c. electrons pass through the specimen.
b. light bounces off the specimen. d. electrons bounce off the specimen. |
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Definition
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Term
Which of the following would measure about 100 m?
a. a grasshopper c. a large virus
b. a human egg d. a DNA double helix |
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Definition
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Term
Which of the following would measure to be about 100 m?
a. a giant sequoia c. a grasshopper
b. a teenage boy d. a bean seed |
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Definition
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Term
If 1 hm = 1 m 10 10, how many millimeters are in 20 hm?
a. 2,000 c. 200,000
b. 20,000 d. 2,000,000 |
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Definition
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Term
How many nanometers are there in a meter?
a. one thousand c. one billion
b. one million d. one trillion |
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Definition
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Term
A crate has a bottom of 16 m2 and a height of 3 m. What is the volume of
the crate?
a. 3 m3 c. 16 m3
b. 4 m3 d. 48 m3 |
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Definition
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Term
If you conclude that your results do not support your hypothesis, you
a. should check your results or calculations for errors.
b. should redo the test, changing the variable.
c. may have to modify your hypothesis and conduct another test.
d. Both (a) and (c) |
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Definition
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Term
If a tested hypothesis does not produce the expected results,
a. the experiment was a waste of time.
b. don't trash the results—it might lead to another discovery.
c. the experiment was done wrong.
d. manipulate the data to fit the hypothesis. |
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Definition
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Term
If it is not possible to construct a controlled experiment in order to test a hypothesis, you
a. can still perform the experiment, hoping that the non-controlled factors will not interfere with the results.
b. should give up and find a different problem to solve.
c. might build a model which allows you to control all the factors and then test your hypothesis.
d. should manipulate the data from a non-controlled experiment to fit the results you would have expected from a controlled experiment. |
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Definition
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Term
A controlled experiment involves
a. a control group, an experimental group, and a standard.
b. a control group, an experimental group, and a variable.
c. a controlled factor, a standard, and a variable.
d. an experimental group, a standard, and a variable. |
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Definition
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Term
A scientist who wants to study the possible side effects of a new medicine would probably
a. give each group the same dose of medicine.
b. survey random people about the medicine's effects.
c. include a control group that receives no medicine.
d. use different numbers of subjects in each treatment group. |
|
Definition
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|
Term
Scientific knowledge changes and grows due to
a. asking new questions and reexamining old ones.
b. the use of new technologies.
c. the discovery of new information.
d. All of the above |
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Definition
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Term
A large quartz crystal is added to a graduated cylinder containing 80 mL of water, raising the level to 90 mL of water. What is the volume of the quartz?
a. 10 cm3 c. 90 mL
b. 80 cm3 d. 90 cm3 |
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Definition
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Term
If you were to write two thousand mockingbirds in SI units, it would be
a. 2 kilomockingbirds. c. 2 millimockingbirds.
b. 2 nanomockingbirds. d. 2 megamockingbirds. |
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Definition
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|
Term
To describe the length of a grain of rice, you would use
a. millimeters (mm). c. meters (m).
b. decimeters (dm). d. kilometers (km). |
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Definition
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|
Term
The measure of how much surface an object has is its
a. length. c. density.
b. volume. d. area. |
|
Definition
|
|
Term
The International System of Units
a. is based on standardized body measurements.
b. contains units that are based on the number 10.
c. is also known as the English system.
d. was invented in China. |
|
Definition
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Term
Cells are
a. the structures that contain all of the materials necessary for life.
b. found in all organisms.
c. sometimes specialized for particular functions.
d. All of the above |
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Definition
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Term
Which of the following is a true statement about all living things?
a. They cannot sense changes in their external environment.
b. They have one or more cells.
c. They do not need to use energy.
d. They reproduce asexually. |
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Definition
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Term
Organisms must have food because
a. food is a source of energy. c. organisms never make their own food.
b. food supplies cells with oxygen. d. All of the above |
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Definition
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|
Term
A change in an organism's environment that affects the organism's activities is a
a. response. c. metabolism.
b. stimulus. d. producer. |
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Definition
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|
Term
Organisms store energy in
a. nucleic acids. c. lipids.
b. phospholipids. d. water. |
|
Definition
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|
Term
The molecule that contains the information on how to make proteins is
a. ATP. c. DNA.
b. a carbohydrate. d. a phospholipid. |
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Definition
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|
Term
The subunits of nucleic acids are
a. nucleotides. c. sugars.
b. oils. d. amino acids. |
|
Definition
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|
Term
____ is a complex carbohydrate manufactured by plants.
a. Oil c. Starch
b. Protein d. Hemoglobin |
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Definition
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|
Term
When a duck dives under water, its inner eyelids automatically raise to cover the duck's eyes. In this case, water acts as
a. homeostasis. c. a reaction.
b. a stimulus. d. an enzyme. |
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Definition
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|
Term
The molecule that provides energy for cellular processes is
a. ATP. c. RNA.
b. DNA. d. protein. |
|
Definition
|
|
Term
The subunits of proteins are
a. enzymes. c. nucleotides.
b. amino acids. d. sugar molecules. |
|
Definition
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|
Term
Cells do not use ____ for energy storage.
a. fats c. carbohydrates
b. oils d. nucleic acids |
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Definition
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|
Term
Which of the following is NOT true of proteins?
a. They are a component of spider webs.
b. They protect cells from foreign material.
c. They are the primary source of energy for cells.
d. They speed up chemical reactions. |
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Definition
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|
Term
Maintaining a body temperature of 37°C and a stable amount of sugar in your blood are both examples of
a. homeostasis. c. photosynthesis.
b. metabolism. d. respiration. |
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Definition
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|
Term
Which of the following is a stimulus?
a. sound c. gravity
b. darkness d. All of the above |
|
Definition
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|
Term
If healthy humans have about five million red blood cells per milliliter of blood, how many red blood cells are there in a liter of human blood?
a. five thousand c. five billion
b. 500 thousand d. five trillion |
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Definition
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|
Term
A monkey is made up of trillions of
a. stimuli. c. eggs.
b. minerals. d. cells. |
|
Definition
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|
Term
The pupils of your eyes respond to which of the following stimuli?
a. sound c. scent
b. light d. touch |
|
Definition
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|
Term
Which of the following organisms reproduces asexually?
a. hydras c. bears
b. rabbits d. frogs |
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Definition
|
|
Term
Most single-celled organisms
a. grow as the cell gets larger.
b. reproduce asexually.
c. do not have cells that perform specific functions.
d. All of the above |
|
Definition
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|
Term
DNA is an acronym for
a. deoxynitrogenous acid. c. decomponutrient acid.
b. deoxyribonucleic acid. d. dinoribonucleic acid. |
|
Definition
|
|
Term
Organisms use energy to
a. move materials into and out of cells. c. make or break down food.
b. build cells. d. All of the above |
|
Definition
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|
Term
Some species of lichens only grow 1 mm every 100 years. If some of these lichens measure 5 cm, approximately how old are they?
a. 5 years old c. 500 years old
b. 50 years old d. 5,000 years old |
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Definition
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Term
Which statement best describes what happens to a single-celled organism when it is eaten?
a. It reproduces sexually.
b. Its energy is transferred to another organism.
c. It reproduces asexually.
d. It maintains homeostasis. |
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Definition
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|
Term
Both fleas and frogs leap in response to a stimulus. If a flea can leap 20 cm, and a frog can jump 5 m, what percentage of the frog's jump is the flea's leap?
a. 0.25 percent c. 25 percent
b. 4 percent d. 40 percent |
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Definition
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|
Term
One characteristic of living things is that they grow and develop. The length of a newborn baby's head is 25 percent of the baby's total height. If the head of a 1.85 m tall adult is 22.2 cm in length, what percentage of the adult's total height is the adult's head?
a. 0.08 percent c. 12 percent
b. 8.3 percent d. 22.2 percent |
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Definition
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|
Term
Living things need water. The human body is approximately 70 percent water. If a student has a mass of 40 kg, what would the student's mass be without the water?
a. 10 kg c. 28 kg
b. 12 kg d. 30 kg |
|
Definition
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|
Term
What are the four basic necessities of life?
a. air, water, food, and living space c. water, air, food, and clothing
b. sunlight, air, water, and food d. sunlight, water, food, and clothing |
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Definition
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|
Term
Most plants are
a. producers. c. decomposers.
b. consumers. d. Both (b) and (c) |
|
Definition
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|
Term
Which statement best describes how producers get the food they need to survive?
a. They break down the nutrients in dead organisms or animal wastes.
b. They use energy from the sun to make food from water and carbon dioxide.
c. They obtain energy and food from the chemicals in their environment.
d. Either (b) or (c) |
|
Definition
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|
Term
Which statement best describes how consumers get the food they need to survive?
a. They use energy from the sun to make food from water and carbon dioxide.
b. They obtain energy and food from the chemicals in their environment.
c. They eat other organisms.
d. They break down the nutrients in dead organisms or animal wastes. |
|
Definition
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|
Term
Which statement best describes how decomposers get the food they need to survive?
a. They eat other organisms.
b. They obtain energy and food from the chemicals in their environment.
c. They use energy from the sun to make food from water and carbon dioxide.
d. They break down the nutrients in dead organisms or animal wastes. |
|
Definition
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|
Term
A salamander is an example of a
a. producer. c. decomposer.
b. consumer. d. scavenger. |
|
Definition
|
|
Term
Fungus is an example of a
a. producer. c. decomposer.
b. consumer. d. scavenger. |
|
Definition
|
|
Term
The human body maintains a temperature of about
a. 37ºC. c. 98.6ºC.
b. 0ºC. d. None of the above |
|
Definition
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|
Term
The metabolism of an organism includes activities such as
a. making food. c. moving materials in and out of cells.
b. building cells. d. All of the above |
|
Definition
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|
Term
A human can survive without water for only
a. two days. c. five days.
b. three days. d. one week. |
|
Definition
|
|
Term
Humans obtain water
a. from the fluids they drink. c. by osmosis.
b. from the food they eat. d. Both (a) and (b) |
|
Definition
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|
Term
The desert-dwelling kangaroo rats obtain water
a. from the fluids they drink. c. by osmosis.
b. from the food they eat. d. Both (a) and (b) |
|
Definition
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|
Term
The cells of which of the following organisms are made up of approximately 70 percent water?
a. a camel c. a dragonfly
b. a cactus d. all of the above |
|
Definition
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Which of the following statements best describes the composition of air?
a. Air is composed only of oxygen.
b. Air is composed only of carbon dioxide.
c. Air is a mixture of different gases.
d. Air is composed only of nitrogen. |
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Starch is a
a. protein. c. complex carbohydrate.
b. simple carbohydrate. d. lipid. |
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Green plants, algae, and some bacteria need ____ to produce food by photosynthesis.
a. sunlight c. water
b. carbon dioxide d. All of the above |
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Which statement does NOT correctly describe how organisms obtain their living space?
a. Organisms often compete with each other for living space.
b. Some organisms require larger amounts of living space than other organisms.
c. All organisms require equal amounts of living space.
d. Organisms will try to keep other organisms away. |
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Carbon, hydrogen, nitrogen, oxygen, phosphorous, and sulfur are the six ____ that make up most substances found in living things.
a. molecules c. carbohydrates
b. elements d. lipids |
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Proteins, nucleic acids, and ATP are ____ found in all cells.
a. molecules c. carbohydrates
b. lipids d. elements |
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After water, ____ are the most abundant materials in cells.
a. proteins c. lipids
b. carbohydrates d. nucleic acids |
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Hemoglobin is a ____ found in red blood cells.
a. protein c. lipid
b. carbohydrate d. nucleic acid |
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Which of the following statements describes the function of enzymes?
a. Enzymes deliver oxygen throughout the body.
b. Enzymes link together to form new proteins.
c. Enzymes form structures, such as your hair.
d. Enzymes make many different chemical reactions in a cell occur quickly. |
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The feathers of birds are made of
a. sugars and starch. c. lipids.
b. carbohydrates. d. proteins. |
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Carbohydrates are a group of compounds made of
a. amino acids. c. nucleotides.
b. enzymes. d. sugars. |
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The sugar in fruits is an example of
a. a protein. c. a simple carbohydrate.
b. a complex carbohydrate. d. a lipid. |
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Table sugar is an example of a
a. protein. c. lipid.
b. simple carbohydrate. d. complex carbohydrate. |
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Complex carbohydrates made by the human body are stored in the
a. kidneys. c. spleen.
b. pancreas. d. liver. |
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When iodine comes into contact with ____, the iodine turns black.
a. protein c. oil
b. starch d. fat |
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When you eat mashed potatoes or French fries, you are eating a plant's stored
a. starch. c. fat.
b. oil. d. protein. |
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When an organism has more sugar than it needs, its extra sugar may be stored in the form of
a. simple carbohydrates. c. lipids.
b. complex carbohydrates. d. phospholipids. |
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Which statement does NOT correctly describe lipids?
a. Fats and oils are lipids.
b. An organism obtains energy from lipids after it has used up most of its carbohydrates.
c. Fats and oils are solid at room temperature.
d. Lipids do not mix with water. |
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Phospholipid molecules form ____ when they come together in water.
a. one layer. c. three layers.
b. two layers. d. four layers. |
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DNA is a(n)
a. carbohydrate. c. phospholipid.
b. enzyme. d. nucleic acid. |
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ATP is an acronym for
a. adenosine triphosphate. c. adenine triprotein.
b. atropine triphosphate. d. alanine triphosphate. |
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Before stored energy can be used by cells, the energy in carbohydrates and fat must first be transferred to
a. amino acids. c. ATP molecules.
b. nucleotides. d. enzymes. |
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When a Venus flytrap catches an insect, it is reacting to the stimulus of
a. sound. c. touch.
b. light. d. scent. |
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Fish that live in the ice-cold waters off Antarctica make a natural antifreeze that keeps them from freezing. This is the fish's way of maintaining a stable environment known as
a. photosynthesis. c. metabolism.
b. homeostasis. d. respiration. |
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Over time, an acorn becomes an oak seedling and then an oak tree. This is an example of
a. reproduction. c. homeostasis.
b. metabolism. d. development. |
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A European diving spider obtains oxygen by
a. holding its breath until it returns to the water's surface.
b. taking in dissolved oxygen from the water.
c. surrounding itself with an air bubble.
d. eating food that contains oxygen. |
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Which of the following are elements found in living things?
a. nitrogen c. hydrogen
b. sulfur d. all of the above |
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Which of the following are characteristics that all organisms share?
a. All living things have DNA. c. All living things have cells.
b. All living things grow and develop. d. all of the above |
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Which of the following is NOT a characteristic that all living things share?
a. All living things reproduce.
b. All living things sense and respond to change.
c. All living things obtain water by drinking.
d. All living things use energy. |
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DNA provides instructions for making
a. proteins. c. complex carbohydrates.
b. simple carbohydrates. d. lipids. |
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The transmission of characteristics from parent to offspring is
a. development. c. heredity.
b. metabolism. d. homeostasis. |
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Which of these organisms would you expect to reproduce sexually?
a. the cheetah
b. the paramecium
c. Both the cheetah and the paramecium
d. Neither the cheetah nor the paramecium |
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Which of these organisms would you expect to reproduce sexually?
a. the cheetah
b. the paramecium
c. Both the cheetah and the paramecium
d. Neither the cheetah nor the paramecium |
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Which of these organisms maintains a stable internal environment?
a. the cheetah
b. the paramecium
c. Both the cheetah and the paramecium
d. Neither the cheetah nor the paramecium |
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Which of these organisms has DNA in its cells?
a. the cheetah
b. the paramecium
c. Both the cheetah and the paramecium
d. Neither the cheetah nor the paramecium |
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| The set of skills or steps that scientists use to answer questions is the ____________________ . (controlled experiment or scientific method) |
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| After recognizing a problem or asking a question, life scientists form one or more ____________________, which are possible explanations for what has been observed. (predictions or hypotheses) |
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| In a controlled experiment, the ____________________ is the one factor that differs between the ____________________ and the experimental group. (prediction, variable group or variable, control group) |
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____________________ is a measure of how much surface an object has.
(Area or Volume) |
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| Life scientists use ____________________ to describe the measurement of an object's mass. (meters or grams) |
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| Scientists often use experiments to test their ____________________, which are possible explanations for observations. (predictions or hypotheses) |
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| A life scientist would use a(n) ____________________ to magnify a living specimen. (electron microscope or compound light microscope) |
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| A set of related hypotheses that are supported by evidence may become accepted as a ____________________ . (theory or scientific method) |
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| ____________________ is the use of knowledge, tools, and materials to solve problems and accomplish tasks. (Technology or Life science) |
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| ____________________ is the study of living things. |
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| A(n) ____________________ is anything in an experiment that can influence the experiment's outcome. |
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| A(n) ____________________ experiment tests only one factor at a time. |
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| he ____________________ is the one factor that differs in a controlled experiment. |
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| A ____________________ microscope is made up of three main parts—a tube with lenses, a stage, and a light. |
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| An ____________________ microscope uses tiny particles of matter called electrons to produce magnified images. |
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| The basic SI unit of length is the ____________________. |
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| ____________________ is a measure of how hot or cold something is. |
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| While making observations to answer a question, you should collect ____________________. |
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| ____________________ are used with SI units to change them to larger or smaller units. |
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| The process of maintaining a stable internal environment is known as ____________________ . (metabolism or homeostasis) |
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| The resemblance of offspring to their parents is a result of ____________________. (heredity or stimuli) |
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| A ____________________ obtains food by eating other organisms. (producer or consumer) |
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| 186. In the cell membrane, ____________________ molecules form two layers. (protein or phospholipid) |
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| 187. When a planarian worm is cut in half, each half develops into a whole worm. This is an example of ____________________ reproduction. (asexual or sexual) |
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Definition
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| ____________________ are sometimes called the blueprints of life. (Proteins or Nucleic acids) |
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| ____________________ is the passing of traits from one generation to the next. (Homeostasis or Heredity) |
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| ____________________ refers to all of the chemical activities that an organism's cells perform. (Metabolism or Homeostasis) |
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| A ____________________ is a membrane-covered structure that contains all of the materials necessary for life. |
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| ____________________ reproduction requires two parents to produce offspring that will share characteristics of both parents. |
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| An organism that makes its own food is called a ____________________. |
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| An organism that gets its food by breaking down the nutrients in dead organisms or animal wastes is called a ____________________. |
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| Proteins are molecules that are made up of ____________________. |
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| ____________________ is the process that converts the energy in sunlight to energy stored in food. |
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| Everything, whether it is living or not, is made up of tiny building blocks called ____________________. |
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| A substance made up of only one type of atom is called an ____________________. |
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| When two or more atoms join together, they form a ____________________. |
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| Special proteins called ____________________ make many different chemical reactions in a cell occur quickly. |
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| The protein ____________________ in red blood cells attaches to oxygen so that oxygen can be delivered throughout the body. |
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| All cells are surrounded by a structure called a ____________________. |
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| The basic unit of all organisms that contains the materials necessary for life is the _____________________. |
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| Do you agree with the following statement? The information learned by life scientists isn't very important. Explain your answer. |
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Definition
| Answers may vary but should reflect an understanding that knowledge of living things has a direct impact on the students' own lives. |
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| Who can be a life scientist? |
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Definition
| Answers may vary but should reflect an understanding that knowledge of living things has a direct impact on the students' own lives. |
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| Why is proving a hypothesis wrong just as helpful as supporting it? |
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Definition
| Anyone from any background can learn to be a life scientist. |
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| What are the three main parts of a compound microscope? |
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Definition
| The three main parts are a tube with lenses, a stage, and a light. |
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| The basic unit of all organisms that contains the materials necessary for life is the _____________________. |
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| A life scientist would use a(n) ____________________ to magnify a living specimen. (electron microscope or compound light microscope) |
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Definition
| compound light microscope |
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| . ____________________ is the amount of matter that makes up an object. |
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| Starch is a ____________________ and is made up of ____________________. (carbohydrate/sugars or nucleic acid/nucleotides) |
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Definition
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| Fats and oils are ____________________ that store energy for an organism. (proteins or lipids) |
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| A scientist who studies mice observes that on the day he feeds the mice vitamins with their meals, they perform better in mazes. What hypothesis would you form to explain this phenomenon? |
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| Sample answer: Vitamins increase the mice's spatial reasoning capabilities. |
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a. What are some stimuli in your environment?
b. How do you respond to these stimuli? |
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a. Answers will vary. Examples can include such things as the way something tasted, smelled, felt, sounded, or looked.
b. Responses to the stimuli should describe the action or effect the stimuli produced in the student. |
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| What do carbohydrates, fats, and oils have in common? |
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| All three compounds store energy. |
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| What factors affect where a plant or animal lives? |
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Definition
| Where a plant or animal lives is affected by competition with other organisms and the availability of water and food that is sufficient to meet the organism's needs. |
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| a. Explain the difference between the structures of simple and complex carbohydrates. b. Give an example of a food source that contains simple carbohydrates and an example of one that contains complex carbohydrates. |
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| a. Simple carbohydrates are made of one or a few sugar molecules linked together. Complex carbohydrates are linkages of many simple sugar molecules. b. Sample answer: The sugar found in fruit is a simple carbohydrate. The starch found in potatoes is a complex carbohydrate. |
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