Biology

The correct answer is: C.Activate protein kinase

Explanation:

In the signal transduction pathway, cAMP (cyclic adenosine monophosphate) acts as a second messenger. It is produced in response to receptor activation and plays a crucial role in transmitting the signal inside the cell. One of its main functions is to activate protein kinase A (PKA), which then phosphorylates various target proteins to initiate a cellular response.

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