All are second messenger except: (A) Cyclic AMP, (B) Gaunylyl cyclase, (C) Diacycglycerol, (D) Inositol triphosphate
Answer is B. remember that guanylyl cyclase an enzyme while cGMP is a secondary messenger Types ot secondary messenger are There are three basic types of secondary messenger molecules Hydrophobic (DAG) Hydrophilic(cAMP) Gases(NO) Ref-KDT 7/e p47,48