How does Viagra enhance erectile function of the penis?
a) by preventing cGMP production
b) by inhibiting guanylyl cyclase activity
c) by inhibiting cGMP phosphatase
d) by inhibiting nitric oxide release
e) by inhibiting cGMP phosphodiesterase
Ans: e) by inhibiting cGMP phosphodiesterase
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The most successful parasites are the ones that live in harmony with their hosts
Indicate whether this statement is true or false.
The efficiency of photosynthesis is reduced
a. by the damaging effects of excess humidity. b. by the damaging effects of excess intermediates in the light-dependent reactions. c. by the low efficiency of ATP synthase. d. by inhibition of rubisco by excess ATP. e. by a lack of ATP.
Metagenomic studies of prokaryotes have
revealed that
a. there is very little diversity among bacteria. b. archaea are more closely related to bacteria than to eukaryotes. c. bacteria and archaea are essentially the same organisms. d. most archaea evolved from viruses. e. none of these things were revealed by metagenomic studies
Continental drift is caused by
A) tidal forces. B) ocean currents. C) plate tectonics. D) long-term weathering. E) earthquakes.