True/False
Indicate whether the sentence or statement is true
or false.
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1.
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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 the particles are evenly dispersed.
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2.
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When
the concentration of dissolved particles outside a cell is equal to the concentration of dissolved
particles inside the cell, the cell solution is isotonic.
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3.
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Membranes are selectively permeable if they allow only certain substances to move
across them.
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4.
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A
cell placed in a strong salt solution would probably burst because of osmosis.
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5.
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Water
will diffuse out of a cell when the cell is placed in a hypertonic solution.
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6.
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Osmosis is the diffusion of starch molecules through a selectively permeable
membrane.
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7.
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The
binding of specific molecules to ion channels controls the ability of particular ions to cross the
cell membrane.
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8.
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To
pass through a cell membrane, water requires carrier proteins.
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9.
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In
facilitated diffusion, carrier proteins require energy to transport substances across the cell
membrane.
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10.
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The
transport of specific particles down their concentration gradient through a membrane by carrier
proteins is known as facilitated diffusion.
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11.
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Diffusion is an active process that requires a cell to expend a great deal of
energy.
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12.
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Diffusion through ion channels is a form of active transport.
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13.
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Facilitated diffusion moves molecules and ions against their concentration gradient,
while active transport moves molecules and ions down their concentration gradient.
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14.
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Passive transport uses ATP to move molecules against their concentration
gradient.
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15.
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In
active transport, energy is required to move a substance across a cell membrane.
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16.
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The
sodium-potassium pump requires energy to move ions across the cell membrane.
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17.
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The
sodium-potassium pump moves sodium ions and potassium ions against their concentration
gradient.
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18.
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The
sodium-potassium pump transports sodium ions out of a cell while causing potassium ions to move into
the cell.
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19.
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The
sodium-potassium pump uses ATP.
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20.
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Exocytosis is a process that uses vesicles to capture substances and bring them into a
cell.
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21.
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Exocytosis helps the cell rid itself of wastes.
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22.
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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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23.
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Exocytosis does not use energy to expel proteins from the cell.
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24.
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Receptor proteins pump sodium ions into a cell.
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25.
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Receptor proteins may cause the formation of a second messenger molecule inside a
cell.
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26.
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A
receptor protein sends signals into a cell by transporting a specific molecule through the cell
membrane.
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Completion
Complete each sentence or
statement.
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27.
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The
random motion of particles of a substance that causes the substance to move from an area of high
concentration to an area of lower concentration is called ____________________.
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28.
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The
diffusion of ____________________ through cell membranes is called osmosis.
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29.
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Substances always flow from an area of high concentration to an area of
____________________ concentration.
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30.
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When
the concentration of free water molecules is higher outside a cell than inside the cell, water will
diffuse ____________________ the cell.
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31.
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If a
cell is placed in a(n) ____________________ solution, water will flow out of the cell.
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32.
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If a
cell is placed in a(n) ____________________ solution, water will flow into the cell.
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33.
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If a
cell is placed in a(n) ____________________ solution, water flows into the cell at a rate that is
equal to the rate at which water flows out of the cell.
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34.
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Diffusion of ions through ion channels is a form of ____________________
transport.
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35.
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If
the interior of a typical cell is negatively charged, ____________________ charged ions will not
require energy to diffuse into the cell using an ion channel.
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36.
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In
facilitated diffusion, ____________________ proteins are used to transport substances down their
concentration gradient.
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37.
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In
____________________ ____________________, carrier proteins do not require energy to transport amino
acids into a cell.
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38.
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Carrier proteins ____________________ shape to transport sugars to the interior of
cells.
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39.
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A
cell does not expend ____________________ when diffusion takes place.
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40.
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Active transport requires the use of ____________________ by a cell.
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41.
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The
____________________-____________________ pump transports ions against their concentration
gradients.
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42.
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The
sodium-potassium pump uses energy supplied by ____________________.
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43.
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The
sodium-potassium pump prevents the accumulation of ____________________ ions inside the
cell.
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44.
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The
movement of a substance into a cell by a vesicle is called ____________________.
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45.
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Refer
to the illustration above. The process shown in figure B is called
____________________.
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46.
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Refer
to the illustration above. Cells often engulf extracellular particles and fluid, as shown in figure
A. This is called ____________________.
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47.
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Receptor proteins can change the ____________________ of the cell
membrane.
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48.
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Receptor proteins may act as ____________________, catalyzing certain chemical
reactions inside the cell.
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49.
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In
the cell membrane, proteins that transmit information into the cell by responding to signal molecules
are called ____________________.
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