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| The process by wh intercal conditions fairly constant is called |
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| what is the term for a group of organisms of one trupe of living in the same place? |
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| in the metric sustem, the basic unit of length is the |
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| the basic unit of mass in SI is the |
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| what is the highest possible magnification that a scientist can use in order to study living cells? |
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| 1,000x with a compound light microscope |
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| when enough experimental data support a hypotheiss, the hypothesis becoms a |
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| may be revised or replaced |
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| to observe a small, living organsim, a scientist might use a |
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| compound light microscope |
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| what is the term given to a group of cells that develops from a single original cell? |
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| scientific hypotheses usually must be proposed in a way that |
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| enables them to be tested |
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| a controlled experiment allows the scientist to isolate and test |
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| what technique is sed to separate the different cell parts? |
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| the work of scientists usually begins with |
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| hypotheses may arise from |
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1. prior knowledge
2. logical inference
3. informed, creative imagination |
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| wqhat is the smallest unit that is considered to be alive? |
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| what number is the metric system based off of? |
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| what is the variable that is deliberately changed called? |
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| during an experiment, measruing the height of a plant in centimeters would be an example of collecting |
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| the name given to the idea that life could arise from nonliving matter is |
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| based on his observations, Redi made a prediction that keeping flies away form meat would prevent |
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| what scientist finally sttled the argument over whether or not life could arise form nonliving matter? |
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| what is the revised version of the metric system called? |
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| SI. It stands for the Systeme International d'Unites |
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| in science, a theory is a well-tested explanation that unifies a broad range of |
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| the combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes is called |
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| needham's fallacy in his experiment was assuming that ________ would kill all the animacules. |
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| Spallanzani improved on Needham's experiment by ________ the flasks of broth |
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| what is the boiling point for water in degrees celcius? |
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| the space surrounding the nucleas of an atom contais |
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| if an atom contains 4 protons, 4 neutrons, and 3 edlectrons, its mass number would be |
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| isotopes are atoms of the same element with the same number of protons and |
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| a different number of neutrons |
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| what are the 3 uses of radioactive isotopes |
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Definition
1. determine the age of rocks and fossils
2. can be used to treat cancer and kill bacteria that causes food to spoil
3. can be used as tracers to follow the movements of substances within organisms |
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Term
| if an atom contains 11 protons and 12 neutrons, its atomic number is |
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| a substance formed by the combination of two or more elements in definite proportions |
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| a covalent bond is formed as the result of |
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| what type of electron is available to form bonds |
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| what type of ion forms when an atom loses electrons |
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| ice floats on water because |
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| water expands when it freezes |
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| the most abundant compound in most living things is |
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| water molecules are polar with the |
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Definition
| oxygen side being slightly negatice and the hydrogen side being slightly positive |
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Definition
| evenly distributed mixture of two or more substances |
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| if you stir salt into boiling water, you produce a |
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| mixture called a solution |
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| when salt is dissolved in water, water is the |
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| while preparing a cell culture, a scientist places a colony a bacteria into dissolved water and stirs it up. this mixture of water and living cells would best be called a |
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| solutions that contains concentrations of H+ ions lower than pure water(have less H+ ions than pure water) |
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| what are the 3 functions of proteins |
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Definition
1. help fight diseases
2. control the rate of reactions and regulate cell processes
3. build tissues such as bone and muscle |
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Term
| when hydrogen and oxygen combine to form water, water is |
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| identify the reactants in the chemical reaction CO+H2O-->H2CO3 |
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| what is the process that changes one set of chemical into another set of chemicals |
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Definition
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| what is the term used to describe the energy needed to get a reaction started |
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Definition
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Term
| chemical reactions that release energy |
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Definition
| often occur spontaneously |
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Term
| a substance that accelerates the rate of a chemical reaction is called a |
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| what organic compund is the main source of energy |
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Definition
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| what is the basic unit of matter |
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Definition
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| what is the greastest solvent in the world |
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| the subatomic particles that make up atoms are protons, neutrons, and _____ |
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| of the three subatominc particles,________ are most involved in forming chemical bonds |
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Term
| if an electrically neutral atom contains 15 protons, it must also contain 15 ________ |
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Term
| becuase they have the same number of protons and electrons, all isotopes of an element have the same ____________ properties |
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Definition
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| a chemical bond formed by the transfer of electrons is an ________ bond |
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Term
| due to ___________________ forces, the structure of a geckos feet enables it to climb up vertical surfaces |
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Definition
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| the pH scale is a measurement system that indicates the concentration of ______________ in solution |
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Definition
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| what are the four groups of organic compounds found in living things? |
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Definition
| lipids, proteins, carbohydrates, and nucleic acids |
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Term
| who was one of the first people to identify and see cork cells? |
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Definition
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Term
| the work of schleiden and schwann can be summarized by saying that |
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Definition
| all plants and animals are made of cells |
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Term
| what are the principles of the cell theory |
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Definition
1. cells are the basic units of life
2. all living things are made of cells
3. all cells are produced by existing cells |
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Term
| electron microscopes can reveal details |
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Definition
| 1000 times smaller than those visible in light microscopes |
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Term
| looking at a cell under a microscope, you note that it is a prokaryote. How do you know? |
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Definition
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Term
| what type of cell contains a nucleus |
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Definition
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| why are nucleus' important |
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Definition
| they contain coded instructions for making proteins |
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Term
| which organelle breaks down food into molecules the cell can use |
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Definition
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| which structure makes proteins using coded instructions that come from the nucleus |
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Definition
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| which organelle converts the chemical energy stored in food into compound that are more convenient for the cell use |
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Definition
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Term
| which organelles help provide cells with energy |
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Definition
| mitochondria and chloroplasts |
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Term
| what is the sequence that traces the path of a protein in the cell? |
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Definition
| rough ER, Golgi Apparatus, released from the cell |
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Term
| which organelle would you expect to find in plant cells but not animal cells |
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Definition
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Term
| which structures carry out cell movement |
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Definition
| microtubules and microfilaments |
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Term
| the cell membrane contains channels and pumps that help move matierials from one side to the other. what are these channels and pumps made of? |
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Definition
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Term
| diffusion is the movement of molecules from |
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Definition
| an area of high concentration to an area of low concentration |
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Definition
| molecules constantly move and collide with each other |
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