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

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



A) Second messengers act through receptors called K-proteins.
B) Second messengers usually inactivate protein kinase enzymes.
C) Cyclic AMP and calcium may be second messengers.
D) Second messengers usually act to remove nitric oxide (NO) from the cell.



Answer: C


Learn More :