True/False
Indicate whether the sentence or statement is true
or false.
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1.
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Diffusion is an active process that requires a cell to expend a great deal of
energy.
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2.
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During diffusion, molecules diffuse from a region where their concentration is low to
a region where their concentration is higher until they are evenly dispersed.
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3.
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A
cell placed in a strong salt solution would probably burst because of an increase in osmotic
pressure.
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4.
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When
the concentration of solutes outside the cell is equal to the concentration of solutes inside the
cell, the cell solution is isotonic relative to its environment.
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5.
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Diffusion occurs only in living systems.
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6.
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The
transport of specific particles through a membrane by carrier proteins is known as facilitated
diffusion.
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7.
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Ion
channels are usually able to transport only one type of ion.
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8.
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Facilitated diffusion moves molecules and ions in one direction only, while active
transport moves them in two directions.
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9.
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In
active transport, energy is required to move a substance across a cell membrane.
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10.
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Both
the sodium-potassium pump and the proton pump require energy to move particles across the cell
membrane.
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11.
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The
sodium-potassium pump moves sodium and potassium ions against the concentration
gradient.
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12.
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Exocytosis helps the cell rid itself of wastes.
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13.
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During the process of exocytosis, the cell membrane extends to engulf substances that
are too big to pass through the cell membrane.
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Completion
Complete each sentence or
statement.
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14.
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Active transport systems are a form of cell transport that requires energy from
molecules of ____________________.
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15.
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____________________ allows a cell to stockpile substances in far greater
concentrations than they occur outside the cell.
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16.
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The
transport of food into cells involves the action of the sodium-potassium pump and
____________________ channels.
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A
B
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17.
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Refer
to the illustration above. The process shown in figure “B” is called
____________________.
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18.
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Refer
to the illustration above. Cells often trap extracellular particles and fluid. This is shown in
figure ____________________.
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19.
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The
process in which an amoeba engulfs its prey and takes it in is known as
____________________.
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