Which of the following functions by diffusing across the cell membrane to bind to intracellular protein receptors, resulting in gene activation or repression?
A) Acetylcholine
B) Insulin
C) Nitric oxide
D) Prostaglandin
E) Testosterone

Question

Quizplus · Accepted Answer

Testosterone is a steroid hormone that can diffuse across the cell membrane and bind to intracellular protein receptors, resulting in gene activation or repression. Acetylcholine, insulin, nitric oxide, and prostaglandin are all examples of signaling molecules that bind to extracellular receptors and activate signaling pathways through second messengers or other mechanisms.

Which of the Following Functions by Diffusing Across the Cell