Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers usually inactivate protein kinase enzymes.
B) Second messengers usually act to remove nitric oxide (NO) from the cell.
C) Cyclic AMP and calcium may be second messengers.
D) Second messengers act through receptors called K-proteins.

Question

Quizplus · Accepted Answer

Cyclic AMP and calcium are commonly known second messengers. Second messengers act as intermediaries to relay signals from the extracellular environment to the inside of a cell. They do not usually inactivate protein kinase enzymes, nor do they act to remove nitric oxide from the cell. There are no receptors called K-proteins associated with second messenger signaling.

Which of the Following Statements Is Most Correct Regarding the Intracellular