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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As a
result of diffusion, the concentration of many types of substances a. | always remains
greater inside a membrane. | b. | eventually becomes balanced on both sides of a
membrane. | c. | always remains greater outside of a
membrane. | d. | becomes imbalanced on both sides of a
membrane. | | |
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2.
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Diffusion is the movement of a substance a. | only through a
lipid bilayer membrane. | b. | from an area of low concentration to an area of higher
concentration. | c. | only in liquids. | d. | from an area of
high concentration to an area of lower concentration. | | |
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3.
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The
dispersal of ink in a beaker of water is an example of a. | diffusion. | c. | active
transport. | b. | osmosis. | d. | endocytosis. | | | | |
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4.
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The
diffusion of water into or out of a cell is called a. | solubility. | c. | selective
transport. | b. | osmosis. | d. | endocytosis. | | | | |
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5.
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A
cell will swell when it is placed in a(n) a. | hypotonic solution. | c. | isotonic solution. | b. | hypertonic
solution. | d. | None of the
above | | | | |
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6.
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The
interior portion of a cell membrane forms a nonpolar zone that a. | allows polar
molecules to pass through the membrane. | b. | allows food to pass through the
membrane. | c. | prevents ions and most large molecules from passing through the
membrane. | d. | None of the above | | |
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7.
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Ion
channel gates close the pores of some ion channels in response to a. | stretching of
the cell membrane. | b. | a change in electrical charge. | c. | the binding of
specific molecules to the channel. | d. | All of the above | | |
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8.
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Proteins that act like selective passageways in the cell membrane are known
as a. | marker
proteins. | c. | receptor
proteins. | b. | channel proteins. | d. | None of the above | | | | |
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9.
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Transport proteins that allow ions to pass through the cell membrane are
called a. | receptor
proteins. | c. | ion
channels. | b. | marker proteins. | d. | None of the above | | | | |
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10.
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Sugar
molecules cross the cell membrane by a. | active transport. | c. | osmosis. | b. | facilitated
diffusion. | d. | gated
channels. | | | | |
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11.
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Sugar
molecules can enter cells through the process of a. | exocytosis. | c. | osmosis. | b. | facilitated
diffusion. | d. | ion
pumps. | | | | |
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12.
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Which
of the following does not require energy? a. | diffusion | c. | active transport | b. | endocytosis | d. | sodium-potassium
pump | | | | |
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13.
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Unlike passive transport, active transport a. | requires
energy. | b. | moves substances down their concentration
gradient. | c. | does not involve carrier proteins. | d. | All of the
above | | |
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14.
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Both
active transport and facilitated diffusion involve a. | ATP. | b. | movement against a concentration
gradient. | c. | carrier proteins. | d. | All of the
above | | |
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15.
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Which
of the following is a form of active transport? a. | osmosis | c. | facilitated diffusion | b. | diffusion | d. | sodium-potassium
pump | | | | |
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16.
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The
sodium-potassium pump a. | is a carrier protein | c. | is located in the cytoplasm of a
cell. | b. | uses passive transport. | d. | transports sugar molecules. | | | | |
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17.
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The
sodium-potassium pump usually pumps a. | potassium ions out of the cell. | b. | sodium ions into
the cell. | c. | potassium ions into the cell. | d. | only potassium
ions and sugar molecules. | | |
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18.
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The
sodium-potassium pump a. | increases the concentration of sodium ions inside a
cell. | b. | decreases the concentration of sodium ions inside a
cell. | c. | increases the concentration of potassium ions inside a
cell. | d. | Both (b) and (c) | | |
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19.
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Proteins and polysaccharides that are too large to move into a cell through diffusion
or active transport move in by a. | exocytosis. | c. | the sodium-potassium pump. | b. | endocytosis. | d. | None of the
above | | | | |
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20.
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Molecules that are too large to be moved through the membrane can be transported into
the cell by a. | osmosis. | c. | exocytosis. | b. | endocytosis. | d. | diffusion. | | | | |
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21.
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Molecules that are too large to be moved across a cell membrane can be removed from
the cell by a. | diffusion. | c. | endocytosis. | b. | exocytosis. | d. | osmosis. | | | | |
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22.
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Ridding the cell of materials by discharging the materials in vesicles is
called a. | osmosis. | c. | exocytosis. | b. | diffusion. | d. | endocytosis. | | | | |
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23.
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Signal molecules bind to a. | carbohydrates. | c. | receptor proteins. | b. | marker
proteins. | d. | transport
proteins. | | | | |
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24.
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When
a signal molecule binds to a receptor protein, the receptor protein may a. | change the
permeability of the membrane. | b. | cause the formation of a second messenger
molecule. | c. | catalyze certain chemical reactions in the
cell. | d. | All of the above | | |
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25.
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Which
of the following transmit information into a cell by binding to signal molecules? a. | channel
proteins | c. | marker
proteins | b. | receptor proteins | d. | end proteins | | | | |
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