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Cyclic AMP is a well-known example of

  • A.a second messenger
  • B.a steroid hormone
  • C.a membrane receptor
  • D.a transcription factor

Answer: A

Made from ATP by adenylyl cyclase when a receptor is activated, it spreads the signal through the cell by activating protein kinase A. Calcium ions and inositol trisphosphate are other examples. A second messenger amplifies the signal as well as spreading it.

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