A particular membrane transport process exhibits saturation, uses carrier molecules, but does NOT require ATP. The process is probably
A. active transport.
B. osmosis.
C. phagocytosis.
D. pinocytosis.
E. facilitated diffusion.
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Question 2) A runner produced hypotonic sweat while running a marathon in hot weather. After the race, he drank large volumes of water. As a result of the water intake, his body cells will
A. shrink.
B. swell.
C. crenate.
D. shrivel.
E. not change.
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Question 3) A person suffered burns over a large part of his body. Evaporation of fluid from the surface of burned areas occurs. As a result of the evaporation process, cells will tend to
A. first swell and then resume their original shape.
B. rupture.
C. swell.
D. remain unchanged.
E. shrink.
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Question 4) If a 0.9 NaCl (saline) solution is isotonic to a cell, then a solution of 3.5 NaCl would be
A. hypertonic to the cell.
B. isotonic to the cell.
C. hypotonic to the cell.
D. catatonic to the cell.
E. All of these choices are correct.
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Question 5) If 0.9 NaCl (saline) solution is isotonic to a cell, then a 0.5 saline solution
A. will not affect the cell.
B. is hypotonic to the cell.
C. will cause crenation of the cell.
D. will shrink the cell.
E. is hypertonic to the cell.
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Question 6) Solution A contains 5 grams of sugar per liter while solution B contains 2 grams of sugar per liter. The solutions are separated by a selectively permeable membrane.
If the solvent in both solutions is water, predict in which direction most of the water molecules will move.
A. move by simple diffusion from solution A to solution B
B. move by osmosis from solution B to solution A
C. move by active transport from solution B to solution A
D. move by filtration from solution A to solution B
E. There will be no movement of water.
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Question 7) The greater the concentration of a solution, the greater the
A. osmotic pressure of the solution.
B. rate of facilitated diffusion.
C. tendency for water to diffuse from the solution.
D. number of carrier molecules present.
E. amount of solvent.
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Question 8) A red blood cell that is placed in a hypertonic solution
A. loses water.
B. gains water.
C. floats.
D. ruptures.
E. neither gains nor loses water.
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Question 9) Which of the following will increase the rate of diffusion?
A. an increase in the viscosity of the solvent
B. an increase in the temperature
C. an increase in the molecular weight of the diffusing particles
D. an increase in the distance the molecules have to travel
E. All of these choices are correct.
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Question 10) Osmosis is the diffusion of _____ across a selectively permeable membrane.
A. sugar
B. sodium
C. oxygen
D. urea
E. water
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