One inhibitor of cGMP is Viagra. It provides a signal that leads to dilation of blood vessels and increase of blood in the penis, facilitating erection. Since cGMP is inhibited, the signal is prolonged. The original signal that is now inhibited would have
A) hydrolyzed cGMP to GMP.
B) hydrolyzed GTP to GDP.
C) phosphorylated GDP.
D) dephosphorylated cGMP.
E) removed GMP from the cell.

Question

Quizplus · Accepted Answer

The hydrolysis of cGMP to GMP is a normal process that would have eventually turned off the signal for vasodilation and erection. However, Viagra inhibits the enzyme responsible for hydrolyzing cGMP, hence prolonging the signal and facilitating an erection.

One Inhibitor of CGMP Is Viagra