Refer to the figure below. Which action could the cell use to turn off the signal transduction pathway shown, as part of a regulatory mechanism?
A) Increase the concentration of an NO synthase activator.
B) Turn off expression of the guanylyl cyclase gene.
C) Decrease the concentration of a calcium ion channel protein inhibitor.
D) Activate expression of the phospholipase C gene.
E) Increase arginine synthesis.

Question

Refer to the figure below.  Which action could the cell use to turn off the signal transduction pathway shown, as part of a regulatory mechanism?
A) Increase the concentration of an NO synthase activator. 
B) Turn off expression of the guanylyl cyclase gene. 
C) Decrease the concentration of a calcium ion channel protein inhibitor. 
D) Activate expression of the phospholipase C gene. 
E) Increase arginine synthesis.

Quizplus · Accepted Answer

Turning off the expression of the guanylyl cyclase gene, which produces the messenger molecule cGMP, would prevent the activation of downstream signaling molecules, thus disabling the signal transduction pathway.

Refer to the Figure Below