Life Science: Life's Structure and Function, Book A

Chapter 3: Cell Processes

Standardized Test Practice

1.
A salt crystal is held together by

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A)covalent bonds.
B)proteins.
C)water molecules.
D)attractions between ions.
2.
A cell that contains 50% water is placed in a solution that is 30% water. The cell and the solution will reach equilibrium when they both contain how much water?
A)40%
B)30%
C)50%
D)80%
3.
According to this information, which organic compound is the most flexible?

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A)chitin
B)collagen
C)keratin
D)cellulose
4.
According to this information, which body part would you expect to be the least flexible?

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A)crab shell
B)bone
C)hair
D)plant cell wall
5.
Which process releases energy by changing simple molecules?
A)endocytosis
B)photosynthesis
C)respiration
D)fermentation
6.
Which of the following is an example of a protein?
A)RNA
B)skin
C)fat
D)starch
7.
What is DNA an example of?
A)carbohydrate
B)lipid
C)nucleic acid
D)protein
8.
Which of these processes uses transport proteins in the cell membrane to move materials into or out of a cell?
A)diffusion
B)exocytosis
C)active transport
D)osmosis
9.
Which of these regulates nearly all the chemical reactions in the body by causing changes in other molecules without being changed itself?
A)carbohydrates
B)inorganic compounds
C)enzymes
D)lipids
10.
Which of these is an example of an inorganic compound?
A)carbohydrate
B)lipid
C)nucleic acid
D)water
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