The energy that must be added to cause molecules to react with one another is called the energy of
a. endergonic.
b. activation.
c. exergonic.
d. chemical.
Answer: b. activation.
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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because
A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.
Which of the following do anaerobic
methanogens produce?
a. carbon monoxide b. carbon dioxide c. ammonia sulfide d. methane e. hydrogen sulfide
Sea snakes, which are reptiles, are similar in body form to eels, which are fish. Sea snakes and eels therefore
demonstrate:a. role reversal. b. ancestral traits c. homologous traits. d. divergent evolution. e. convergent evolution.
Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) active transport B) facilitated diffusion C) osmosis D) simple diffusion