In the two-messenger mechanism of the action of protein hormones, the first messenger is the ____, which must bond to a ____ on the cell membranE.
A)receptor/cyclic AMP
B)hormone/receptor
C)receptor/hormone
D)hormone/cyclic AMP

Question

Quizplus · Accepted Answer

In the two-messenger mechanism of the action of protein hormones, the first messenger is the hormone, which must bond to a receptor on the cell membrane. The second messenger is cyclic AMP, which is activated by the receptor-bound hormone and then initiates the intracellular signal transduction pathway.

In the Two-Messenger Mechanism of the Action of Protein Hormones