Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a
membrane more fluid at lower temperatures?
a. The double bonds form a kink in the fatty acid tail, forcing adjacent phospholipids to be
spaced further apart.
b. Unsaturated fatty acids have a higher cholesterol content.
c. Unsaturated fatty acids permit more water in the interior of the membrane.
d. The double bonds block interaction among the hydrophilic head groups of the lipids.
e. The double bonds result in a shorter fatty acid tail.
A
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The plasma membrane Na+/K+-ATPase pump
A. is used to generate sodium and potassium gradients across the membrane. B. is a symporter. C. is a pump for active transport of K+ out of the cell and Na+ into the cell. D. is a pump for facilitated diffusion of K+ into the cell and Na+ out of the cell. E. does not require ATP.
Many sponges produce both eggs and sperm and thus are
a. monoecious. b. dioecious. c. hermaphroditic. d. both a and c.
The earth has gone through a series of mass extinctions caused by a variety of different factors. The current mass extinction is believed to be the result of:
a) global warming. b) loss of the ozone layer. c) reduced levels of speciation. d) normal fluctuations in species diversity. e) human activities.
Four of the following are typical features of anthropoids. Which one is the exception?
A. Diurnal B. Good eyesight C. Color vision D. Carnivorous E. Dry nose