Q: Which molecule acts as the second messenger in the hormone receptor complex?  

Answer: D

In the hormone receptor complex, after the hormone binds to the receptor site, the activated receptor complex stimulates the production of second messengers inside the cell. These second messengers can then bind to and activate other intracellular enzymes or pathways. One of the most important second messengers is cyclic adenosine monophosphate (cAMP), which is synthesized by the enzyme adenylate cyclase. cAMP acts as a signaling molecule that can activate protein kinase A, which phosphorylates target proteins and activates a wide range of cellular processes. Therefore, the correct answer is D) cAMP.

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