Q: What is the first messenger in the hormone receptor complex?  

Answer: A

Hormones are the first messengers in the hormone receptor complex. Hormones bind to specific receptors located on the cell membrane, which leads to the activation of intracellular signaling pathways. This activation initiates a cascade of events, which ultimately leads to the production of a second messenger such as cAMP or IP3. The second messenger then triggers the appropriate cellular response. Therefore, hormones act as the initial signal or first messenger in the hormone receptor complex.

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