Sutherland Discovered That the Signaling Molecule Epinephrine

Sutherland discovered that the signaling molecule epinephrine

A) brings about a decrease in levels of cAMP as a result of bypassing the plasma membrane.
B) causes lower blood glucose by binding to liver cells.
C) interacts with insulin inside muscle cells.
D) interacts directly with glycogen phosphorylase.
E) elevates cytosolic concentrations of cyclic AMP.