Which of the following in not a second messenger-
Ans. is 'd' i.e., Protein kinase * Second messengers are molecules that relay signals from the membrane receptors to target molecules inside the cells. In above described receptors second messengers are cAMP, cGMP, Phosphatidylinositol, diacylgleceral, IP3, Ca+2.* Some gaseous molecule can diffuse both through cytosol and across cellular membranes and act as second messenger. These are nitric oxide (NO), Carbon monoxide (CO) and hydrogen sulphate (H2S).
cAMP
NO
CO
Protein kinase
General