Which of the following compounds is a secondary messenger?

Question

Quizplus · Accepted Answer

cAMP is a well-known example of a secondary messenger. It is produced in response to extracellular signals and can activate downstream signaling pathways by binding to and activating protein kinase A. G-proteins are involved in transducing signals from receptors to intracellular effector molecules but are not themselves secondary messengers. Vasopressin is a peptide hormone that binds to receptors and activates downstream signaling pathways but is not a secondary messenger. GTP is a molecule that plays a critical role in G-protein signaling but is not a secondary messenger.

Which of the Following Compounds Is a Secondary Messenger