All known effects of cyclic AMP in eukaryotic cells results from:: (A) Activation of the catalytic unit of adenylate cyclase, (B) Activation of synthetase, (C) Activation of protein kinase, (D) Phosphorylation of G protein
Answer is C. Cyclic AMP exerts most of its effects by stimulating cAMP-dependent protein kinases. These phosphorylate enzymes resulting in their activation or inhibition.