Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?

Question

Quizplus · Accepted Answer

Cyclic AMP and calcium are both examples of second messengers that transmit signals inside cells. They act as mediators between extracellular signals, such as hormones or neurotransmitters, and intracellular responses, like gene expression or modulating enzyme activity. Option A is incorrect because second messengers often activate protein kinase enzymes, which are involved in many intracellular signaling pathways. Option C is incorrect because there are no receptors called K-proteins; second messengers act through a variety of receptors, depending on the specific signaling pathway involved. Option D is incorrect because second messengers do not act to remove nitric oxide from the cell; nitric oxide can act as a second messenger itself, and is involved in many intracellular signaling pathways.

Which of the Following Statements Is Most Correct Regarding the Intracellular