Which of the following is a key difference between the Phosphoinositide Signaling Pathway and the adenylate cyclase GPCR pathway?

• A. Both pathways use cAMP as a secondary messenger.
• B. The PSP pathway uses IP3 and DAG as secondary messengers, while the adenylate cyclase pathway uses cAMP.
• C. Both pathways activate protein kinase C.
• D. The adenylate cyclase pathway involves the activation of phospholipase C.

Answer: (B)