Cholera produces severe diarrhea by ____
a. increasing the rate at which cells pump out ions
b. decreasing osmosis in small intestinal cells
c. blocking ATP production
d. increasing water pumps in small intestinal cells
e. blocking sodium and potassium channels
ANSWER: a
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Indicate whether the statement is true or false.
A Drosophila larva that develops from an oocyte that has no bicoid mRNA will have what developmental defect?
A. only ventral structures B. no dorsal structures C. only anterior structures D. only posterior structures
Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few genera of detritivores. B. the breakdown of minerals. C. nitrogen-containing fertilizers. D. a few groups of nitrogen-fixing bacteria. E. the breakdown of dead plants.
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What will be an ideal response?