The role of cAMP when it acts as an intracellular mediator in cells is to

A) bind to and activate protein kinase.
B) directly activate genes in the nucleus to produce mRNA by binding to DNA.
C) directly activate structural enzymes in the cytoplasm of the target cell.
D) catalyze a cascade reaction that ultimately activates genes on the DNA.
E) control levels of calcium in the cell.

CAMP

Cyclic adenosine monophosphate; a second messenger important in many biological processes.

Protein Kinase

Class of enzymes that phosphorylates other proteins. Many of these kinases are responsive to other chemical signals (e.g., cAMP, cGMP, insulin, epidermal growth factor, calcium, and calmodulin).

Intracellular Mediator

Molecules inside cells that transmit signals from a cell receptor to a target, playing a key role in cell signaling pathways.