Question

Which of the following statements is TRUE?

A. Extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior.

B. To function, all extracellular signal molecules must be transported by their receptor across the plasma membrane into the cytosol.

C. A cell-surface receptor capable of binding only one type of signal molecule can mediate only one kind of cell response.

D. Any foreign substance that binds to a receptor for a normal signal molecule will always induce the same response that is produced by that signal molecule on the same cell type.

Answer 1

Answer:

it's option A

Explanation:

Extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior.

Example:

Acetylcholine acts as a GPCR on heart muscle to make the heart more slowly.