Imagine a beaker divided down the center by a rigid membrane that is freely permeable to water but impermeable to glucose. Side 1 contains a 10 percent glucose solution and side 2 contains the same volume of pure water. At equilibrium, what will be the situation?
A) Water will continue to move from side 1 to side 2.
B) Water will continue to move from side 2 to side 1.
C) The volume of liquid will be greater in side 1.
D) The volume of liquid will be greater in side 2.
E) The volume of liquid remain equal on both sides.
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Question 2) Which of the following best describes osmosis?
A) active transport of water across the cell membrane
B) diffusion of water from a greater to a lesser water concentration
C) movement of water into a solute
D) diffusion of water from a greater to a lesser water concentration across a selectively permeable membrane
E) random movement of water due to kinetic energy
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Question 3) Water molecules and small ions enter a cell through
A) channels formed by integral membrane proteins.
B) peripheral proteins.
C) lipid channels.
D) peripheral carbohydrates.
E) defects in the lipid layer of the membrane.
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Question 4) There is a direct correlation between the potency of a general anesthetic such as ether and its ability to
A) dissolve in water.
B) dissolve in lipids.
C) bind to proteins.
D) interact with carbohydrates.
E) bind to DNA.
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Question 5) Diffusion of a substance across the cell membrane may be influenced by all of the following except
A) the availability of ATP.
B) the presence of membrane channels for the substance.
C) its charge of the substance.
D) its concentration gradient.
E) its lipid solubility.
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Question 6) Breathing faster and deeper eliminates more carbon dioxide from the body than normal breathing. Under these circumstances, in the lungs
A) more carbon dioxide will diffuse out of the blood.
B) more carbon dioxide will diffuse into the blood.
C) less carbon dioxide will diffuse out of the blood.
D) less carbon dioxide will diffuse into the blood.
E) the amount of carbon dioxide diffusion will remain unchanged.
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Question 7) The movement of oxygen from an area of high concentration to an area of low concentration is an example of
A) osmosis.
B) active transport.
C) diffusion.
D) facilitated transport.
E) filtration.
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Question 8) A cell can increase how fast a substance diffuses across its plasma membrane by inserting channels, which modify the
A) distance across the membrane.
B) concentration gradient of the substance.
C) size and mobility of the substance.
D) membrane's permeability to the substance.
E) charge of the substance.
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Question 9) Cell membranes are said to be ________ because they allow some substances to pass but not others.
A) impermeable
B) doubly amphipathic
C) hydrophilic
D) selectively permeable
E) hydrophobic
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Question 10) The ________ of a cell membrane indicates how easy it is for substances to cross.
A) thickness
B) pliability
C) density
D) permeability
E) charge
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