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 (adenosine monophosphate)
B)hormone/receptor
C)receptor/hormone
D)hormone/cyclic AMP (adenosine monophosphate)

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. This activates the second messenger system, which in many cases involves cyclic AMP (adenosine monophosphate).

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