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. | isotonic | c. | hypotonic | b. | osmotic | d. | hypertonic | | | | |
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2.
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A
cell moves particles from a region of lesser concentration to a region of greater concentration by
_____. a. | active
transport | c. | osmosis | b. | passive transport | d. | facilitated diffusion | | | | |
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3.
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When
some molecules go through a membrane faster than others, the membrane is _____. a. | selectively
permeable | c. | impermeable | b. | permeable | d. | defective | | | | |
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4.
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A
plasma membrane is made up of a(n) _____. a. | enzyme bilayer | c. | cholesterol layer | b. | protein
layer | d. | lipid
bilayer | | | | |
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5.
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Brownian motion is evidence of _____. a. | microorganisms | c. | chemical
energy | b. | polar ions | d. | random motion of molecules | | | | |
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6.
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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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7.
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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. | double | d. | single | | | | |
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8.
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A
plasma membrane is most fluid if it contains _____. a. | proteins | c. | saturated fatty
acids | b. | unsaturated fatty acids | d. | cholesterol | | | | |
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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. | fluid mosaic | c. | bilayer | b. | solid | d. | fatty
acid | | | | |
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10.
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The
structure most responsible for maintaining cell homeostasis is the _____. a. | plasma
membrane | c. | cytoplasm | b. | mitochondrion | d. | cell wall | | | | |
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