Consider this pathway:
Epinephrine → G protein-coupled receptor → G protein → adenylyl cyclase → cAMP
The second messenger in this pathway is ________.
A) cAMP
B) G protein
C) adenylyl cyclase
D) G protein-coupled receptor

Question

Quizplus · Accepted Answer

The question is asking for the second messenger in the pathway, which is cAMP. While the other components (including the G protein-coupled receptor, G protein, and adenylyl cyclase) are required for transmitting the signal, cAMP is specifically designated as the second messenger.

Consider This Pathway: Epinephrine → G Protein-Coupled Receptor → G Protein → Adenylyl