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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Continental drift is caused by

A) tidal forces. B) ocean currents. C) plate tectonics. D) long-term weathering. E) earthquakes.

Biology & Microbiology