Question

How do only certain cells respond to particular signaling molecules that may be sent throughout the body?
a. They express the Ras protein.
b. They express the appropriate receptor.
c.They express the appropriate second messenger(s).
d. They express the appropriate G protein. Submit P

Answer 1

Answer:

b. They express the appropriate receptor.

Explanation:

The signal transductions are extraordinarily specific and sensitive. Specificity is achieved by a precise molecular complementarity between the signal molecules and the receptor. For example, the thyrotropin-releasing hormone produces a response in cells of the adenohypophysis, but not in hepatocytes, which lack the receptors to this hormone.