A Certain Hormone Activates the CAMP Second Messenger System in Its

Multiple Choice

A certain hormone activates the cAMP second messenger system in its target cells. Which of the following would yield the greatest response by a target cell?

A) apply the hormone to the extracellular fluid surrounding the cell
B) inject the hormone into the cytoplasm of the cell
C) apply cAMP to the extracellular fluid surrounding the cell
D) inject activated, cAMP-dependent protein kinase into the cytoplasm of the cell