In the two-messenger mechanism of the action of protein hormones, the second messenger is ____, which activates specific ____ in a cell to bring about the cell's response to the hormonE.
A)cyclic AMP/receptors
B)an enzyme/cyclic AMP molecules
C)cyclic AMP/enzymes
D)a receptor/enzymes

Question

Quizplus · Accepted Answer

In the two-messenger mechanism, the first messenger is the protein hormone that binds to a receptor on the cell surface. This binding activates the enzyme adenylate cyclase, which produces cyclic AMP (cAMP) molecules as the second messenger. The cAMP then activates specific enzymes in the cell, which bring about the cell's response to the hormone. Therefore, the correct answer is choice C, which states that the second messenger is cAMP and it activates specific enzymes in the cell.

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