Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Water
moves into a cell placed in a(n) _____ solution. a. | osmotic | c. | hypertonic | b. | isotonic | d. | hypotonic | | | | |
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2.
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When
some molecules go through a membrane faster than others, the membrane is _____. a. | selectively
permeable | c. | impermeable | b. | defective | d. | permeable | | | | |
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3.
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Diffusion continues until there is no _____. a. | turgor
pressure | c. | concentration
gradient | b. | dynamic equilibrium | d. | homeostasis | | | | |
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4.
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A
cell moves particles from a region of lesser concentration to a region of greater concentration by
_____. a. | passive
transport | c. | osmosis | b. | facilitated diffusion | d. | active transport | | | | |
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5.
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Brownian motion is evidence of _____. a. | chemical
energy | c. | random motion of
molecules | b. | polar ions | d. | microorganisms | | | | |
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6.
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The
structure most responsible for maintaining cell homeostasis is the _____. a. | plasma
membrane | c. | cytoplasm | b. | cell wall | d. | mitochondrion | | | | |
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7.
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A
plasma membrane is most fluid if it contains _____. a. | saturated fatty
acids | c. | proteins | b. | cholesterol | d. | unsaturated fatty acids | | | | |
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8.
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If a
cell is placed in salt water, water leaves the cell by _____. a. | osmosis | c. | active
transport | b. | phagocytosis | d. | diffusion | | | | |
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9.
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Because the phospholipid molecules and some proteins are free to move, the plasma
membrane is said to be a _____. a. | bilayer | c. | fluid mosaic | b. | solid | d. | fatty
acid | | | | |
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10.
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A
cell's contents would be the same as its surroundings, were it not for _____. a. | plasmolysis | c. | selective
permeability | b. | phagocytosis | d. | dynamic equilibrium | | | | |
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