Which of the following statements does not apply to aquaporins?
A. They are water transport channels.
B. They occur in the plasma membrane.
C. They are unique to plant cells.
D. They do not alter the direction of water movement.
E. They speed up osmosis.
Answer: C
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Lipids that form membranes have what kind of structure?
A) completely nonpolar, because they are lipids B) completely polar, which allows them to dissolve in water C) polar heads and nonpolar tails; the nonpolar tails interact with water D) polar heads and nonpolar tails; the polar heads interact with water
High-fat, high-protein diets make the ________ work harder, increasing the risk of problems with this organ
a. pancreas b. liver c. kidneys d. intestines
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates.
The smallest animals are ectotherms
Indicate whether the statement is true or false