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, the first messenger is the hormone which must bond to a receptor on the cell membrane. This interaction activates the receptor, which in turn initiates a series of intracellular signaling events, ultimately leading to the production of a second messenger molecule like cyclic AMP. Therefore, the correct choice is B, hormone/receptor.

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