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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A
cell moves particles from a region of lesser concentration to a region of greater concentration by
_____. a. | facilitated
diffusion | c. | active
transport | b. | osmosis | d. | passive transport | | | | |
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2.
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A
plasma membrane is made up of a(n) _____. a. | cholesterol layer | c. | lipid bilayer | b. | enzyme
bilayer | d. | protein
layer | | | | |
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3.
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Because the phospholipid molecules and some proteins are free to move, the plasma
membrane is said to be a _____. a. | fatty acid | c. | bilayer | b. | solid | d. | fluid
mosaic | | | | |
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4.
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When
some molecules go through a membrane faster than others, the membrane is _____. a. | defective | c. | permeable | b. | impermeable | d. | selectively permeable | | | | |
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5.
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A
plasma membrane is most fluid if it contains _____. a. | unsaturated
fatty acids | c. | saturated fatty
acids | b. | proteins | d. | cholesterol | | | | |
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6.
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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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7.
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Water
moves out of a cell if the cell is placed in a(n) _____ solution. a. | isotonic | c. | passive | b. | hypertonic | d. | hypotonic | | | | |
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8.
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Because cells have a watery environment both inside and outside, the polar ends of the
phospholipids in the plasma membrane form _____ layers. a. | several | c. | mosaic | b. | single | d. | double | | | | |
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9.
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Water
moves into a cell placed in a(n) _____ solution. a. | isotonic | c. | hypertonic | b. | osmotic | d. | hypotonic | | | | |
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10.
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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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