Evaluate the importance of the signaling cycle in maintaining cellular homeostasis.

• A. The signaling cycle promotes continuous activation of adenylate cyclase.
• B. The signaling cycle inhibits the breakdown of glycogen and fat.
• C. The signaling cycle directly activates protein kinase A.
• D. The signaling cycle ensures that signals are terminated and reset, preventing continuous activation and maintaining homeostasis.

Answer: (D)