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Multiple Choice Quiz
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1
Which of the following statements regarding mediated transport across cell membranes is correct?
A)All mediated transport requires the expenditure of metabolic energy.
B)All solutes crossing cell membranes by mediated transport are moved against their concentration gradient (i.e. from low concentration to high concentration).
C)All mediated transport is saturable.
D)A and B.
E)A, B and C.
2
Which of the following descriptions of movement of molecules across the plasma membrane is correct?
A)If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.
B)In diffusion, the rate of movement of a molecule into the cell is directly proportional to the molecule's extracellular concentration.
C)When a carrier becomes saturated, the maximum rate of transport of that carrier's solute across the membrane is reached.
D)A and B.
E)A, B and C.
3
Which of the following statements regarding the active transport of molecules across cell membranes is correct?
A)Primary active transport differs from secondary active transport in that the former uses energy derived from ATP whereas the latter does not.
B)In active transport, the affinity of a given binding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side.
C)In secondary active-transport systems in which Na ions are bound to carriers, the actively transported solute always follows Na ions across the membrane.
D)In secondary active-transport systems in which Na ions are bound to carriers, the actively transported solute always moves across the membrane in the direction opposite of Na ion movement.
E)None of the above.
4
Graphs A and B below depict two ways of determining how molecules (in this case, molecules X, Y, and Z) can gain entry into a cell: (A) Increase the extracellular concentration (Co) of the molecule and measure its flux; and (B) keep Co constant and measure the intracellular concentration (Ci) of the molecule over time until equilibrium is reached.
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From the data given in the graphs,
A)molecule X probably enters the cell by active transport.
B)molecule Y probably enters the cell by facilitated diffusion.
C)molecule Z probably enters the cell by diffusion.
D)A and B.
E)B and C.
5
Regarding the sodium, potassium pump,
A)energy from ATP is directly used to move the sodium and potassium.
B)sodium can be moved either into or out of the cell.
C)more sodium ions are pumped into the cell than potassium ions are pumped out.
D)A and B.
E)A and C.
6
If the cell is placed into a solution containing 350 mOsm of non-penetrating solutes and no penetrating solutes, the cell will
A)shrink as water leaves the cell.
B)swell as water enters the cell.
C)remain the same volume as solute moves from the inside of the cell to the outside.
D)remain the same volume as solute moves from the outside of the cell to the inside.
7
A sample of human cells is placed in a beaker containing a 0.1-M solution of NaCl in 0.1M urea. A second sample of cells is placed in a beaker containing a 0.1-M solution of CaCl2 in 0.1M urea. Which of the following outcomes would you expect?
A)The cells will shrink in both solutions.
B)The cells will swell in both solutions.
C)The cells will not change volume in either solution.
D)The cells in the NaCl solution will swell and those in the CaCl2 solution will shrink.
E)The cells in the NaCl solution will swell and those in the CaCl2 solution will not change volume.
8
Which of the following solutions is isotonic to human red blood cells?
A)150 mM sucrose.
B)300 mM NaCl.
C)150 mM KCl.
D)300 mM urea.
E)None of the above.
9
Two of the solutions in questions 6-8 above are hypotonic to human red blood cells. They are
A)solutions A and B.
B)solutions A and C.
C)solutions A and D.
D)solutions B and C.
E)solutions C and D.
10
Placing human red blood cells in a hypotonic solution would cause them to
A)swell.
B)shrink.
C)first swell, then shrink.
D)first shrink, then swell.
E)stay the same size.
11
Which of the following statements regarding the movement of molecules across cell membranes is correct?
A)Exocytosis is a method by which particles may be brought into a cell.
B)Polar molecules generally diffuse more readily through the plasma membrane than do nonpolar molecules of the same size.
C)In facilitated diffusion, a molecule is moved across a membrane against its concentration gradient.
D)Water molecules are commonly actively transported out of cells.
E)None of the above is correct.
12
The active transport pump for sodium ion in intestinal epithelium
A)is located on the basolateral (blood) side of the cell.
B)is located on the luminal side of the cell.
C)secondarily provides for the active cotransport of glucose and amino acids from the intestinal lumen into the cell.
D)A and C.
E)B and C.
13
The concentration of molecule A is greater inside cells than in the extracellular fluid. This concentration difference can be accounted for by
A)diffusion of A across the cell membrane.
B)synthesis of A by the cell, whose plasma membrane is impermeable to the molecule.
C)facilitated diffusion.
D)active transport mechanisms.
E)B and D.
14
The movement of
A)glucose across cell membranes involves binding with a carrier protein in the membrane.
B)water across a cell membrane is from a region of high solute concentration to a region of low solute concentration.
C)molecules by diffusion over a distance of 25 centimeters would take only a few seconds to reach equilibrium.
D)A and B.
E)A, B and C.
15
If a cell is placed in a hypertonic solution
A)the cell will swell.
B)the concentration of water outside the cell is initially lower than the concentration inside the cell.
C)the concentration of non-penetrating solute inside the cell will decrease.
D)A and C.
E)B and C.
16
How do endocrine glands differ from exocrine glands?
A)Exocrine glands do not secrete hormones; endocrine glands do.
B)Endocrine glands do not secrete hormones; exocrine glands do.
C)Exocrine glands do not contain ducts connecting the gland to an epithelial surface; endocrine glands do.
D)A and C.
E)B and C.
17
In secondary active transport systems in which sodium ions are bound to carriers, the carrier is an ATPase.
A)True
B)False







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