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Science HM Semester 1
Chapters 2-6 in the Prentice Hall California Life Science
40
Science
7th Grade
01/15/2013

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Term
Reflection
Definition
________ occurs when an object or wave bounces back off a surface through which it cannot pass.
Term
Concave Mirror
Definition
A mirror with a surface that curves inward like the inside of a bowl is a ________
Term
The Law of Reflection
Definition
All waves obey _____________. The _________ states that the angle of incidence equals the angle of reflection.
Term
Refraction
Definition
The bending of light waves due to a change in speed known as _________.
Term
Transparent
Definition
A ________ material transmits most of the light that strikes it. When light hits the particles of a _________ material, the particles absorb it but then reemit it, or send it back out, until the light finally passes through to the other side.
Term
Translucent
Definition
A __________ material scatters light as it passes through, just as smoke, fog, and clouds scatter light as it passes through the air.
Term
Opaque
Definition
An _______ material reflects or absorbs alll of the light that strikes it.
Term
Radio Waves
Definition
the electromagnetic waves with the longest wavelengths and the lowest frequencies are __________.
Term
Electromagnetic Spectrum
Definition
The ________ is the complete range of electromagnetic waves placed in order of increasing frequency. The __________ is made up of radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays.
Term
Electromagnetic Waves
Definition
A ______ transfers electrical and magnetic energy. An ______ consists of vibrating electric and magnetic fields that move through space, at the speed of light.
Term
Microscope
Definition
To look at small, nearby objects you can use a ________. A ______ is an optical tool that makes small objects look larger. A _________ uses a combination of lenses to form enlarged images of tiny objects.
Term
Organ System
Definition
An _____ is a group of organs that work together to perform a major function.
Term
Diffusion
Definition
________ is the process by which molecules move from an area of high concentration to an area of lower concentration.
Term
Lysosome
Definition
________ are small, round structures containing chemicals that break down certain materials in the cell.
Term
Vacuoles
Definition
________ are the storage area of the cell, floating in the cytoplasm.
Term
Mitochondria
Definition
________ are known as the "powerhouses" of the cell because they convert food into energy. (rod shaped)
Term
Nucleus
Definition
The control center of the cell, called the _______, is a large, oval structure.
Term
Cell Membrane
Definition
After passing through the cell wall, the next barrier you must cross is the ___________. The _________ forms outside boundary that separates the cell from its environments.
Term
Cell Wall
Definition
A rigid layer of nonliving material that surrounds the cells of plants and some other organisms is called a _________.
Term
Cell Theory
Definition
The ________ is a widely accepted explanation of the relationship between cells and living things. The ______ states the following:
* all living things are made of cells
*cells are the basic units of structure and function in living things
*cells come from other cells
Term
Gene
Definition
The set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait.
Term
Base-Pair Rule
Definition
DNA
A T C G C T T A
T A G C G A A T
tRNA
C A G G A U C C G
G U C C U A G G C
Term
DNA
Definition
Deoxyribonucleic Acid; the genetic material that carries information about an organism and is passed from parent to offspring
Term
Replication
Definition
The cell makes an exact copy of the DNA in its nucleus in a process called ______.
Term
Cell Cycle
Definition
The regular sequence of growth and division that cells undergo is known as the ________.
Term
Mitosis
Definition
_______ is the stage during which the cell's nucleus divides into two new nuclei. During _______, one copy of the DNA is distributed into each of the two daughter cells.
Term
Respiration
Definition
________ is the process by which cells obtain energy from glucose.
Term
Photosynthesis
Definition
The process by which a cell captures energy in sunlight and uses it to make food is called _________.
Term
Hybrid
Definition
An organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait
Term
Alleles
Definition
the different forms of a gene
Term
Punnet Square
Definition
A chart that shows all the possible combinations of alleles that can result from a genetic cross
Term
Genotype
Definition
An organisms genetic makeup, or allele combinations
Term
Phenotype
Definition
An organisms physical appearance or visible traits
Term
Homozygous
Definition
Having two identical alleles for a trait
Term
Heterozygous
Definition
Having two different alleles for a trait
Term
Meiosis
Definition
The process that occurs in the formation of sex cells (sperm and egg) by which the number of chromosomes is reduced by half
Term
Chromosome
Definition
A doubled rod of condensed chromatin
Term
mRNA
Definition
RNA that copies the coded message from DNA in nucleus and carries it to the cytoplasm.
Term
tRNA
Definition
RNA in the cytoplasm that carries an amino acid to the ribosome and adds to the growing protein chain.
Term
Mutation
Definition
A change in a gene or chromosome
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