Georgia Science Grade 7

Chapter 3: Cell Processes

CRCT Practice

1
Which describes a substance that is made up of only one kind of atom and cannot be broken down by chemical reactions?
A)electron
B)carbohydrate
C)element
D)molecule
2
What kind of chemical compound do salt and water form?
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A)covalent
B)ionic
C)solution
D)lipid
3
Salt is very important in the human body. What kind of compound is salt?

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A)organic
B)carbohydrate
C)protein
D)inorganic
4
A cell that contains 40% water is placed in a solution that is 20% water. The cell and the solution will reach equilibrium when they both contain how much water?
A)30%
B)40%
C)60%
D)20%
5
What is needed for all chemical reactions in cells?
A)enzymes
B)lipids
C)DNA
D)cell membrane
6
What process produces the carbon dioxide that you exhale?
A)osmosis
B)DNA synthesis
C)photosynthesis
D)cellular respiration
7
Which is needed to hold matter together or break it apart?
A)gas
B)liquid
C)energy
D)temperature
8
According to this information, which organic compound is the least flexible?

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A)keratin
B)collagen
C)chitin
D)cellulose
9
All chemical reactions in living things take place in what kind of a solution?
A)protein
B)water
C)gas
D)solid
10
What is the sum of all the chemical reactions in an organism?
A)respiration
B)metabolism
C)fermentation
D)endocytosis
11
Explain where the starch in a potato comes from.
A)cellular respiration
B)reproduction
C)photosynthesis
D)homeostasis
12
What is the source of energy for the photosynthesis reactions?
A)chemical energy
B)sunlight energy
C)mechanical energy
D)thermal energy
13
Where do the photosynthesis reactions take place in a cell?
A)cell menbrane
B)nucleus
C)cell wall
D)chloroplast
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