In the mechanism of action of a protein hormone, one of the second messengers is

Options

A. cyclic AMP
B. insulin
C. `T_(3)`
D. gastrin.

Answer

A

Explanation

The molecules of hormones that are amino acid derivatives, peptides or protiens are large and insoluble in lipids and cannot enter the target cell. Therefore, they actg at the cell surface. They bind to specific receptor molecuels located on the cell membrane and generate second messenger, e.g., cyclic AMP, `IP_(3),Ca^(++)`, etc.