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