The Biology Project > Cell Biology > Cell Signaling > Problem Set

Cell Signaling Problem Set

Problem 7: Second Messengers

Correct!

Sending a signal through the cell membrane can lead to the production of second messengers inside the cell. Which of the following can serve as second messengers?

A.	cAMP
B.	Ca2+
C.	IP3
D.	NO (nitric oxide)
E.	all of the above Yes, a large number of small molecules can act as "second messengers." Second messengers are generated when a signal (ligand) binds to a membrane receptor. Cells are programmed for responses, and the same signal and second messenger can have very different effects depending on the programs operating in the cell.

The Biology Project > Cell Biology > Cell Signaling > Problem Set