What is true about protein hormones?
A) They can bind anywhere within the cell.
B) They can bind anywhere on the cell membrane.
C) They must bind to receptors on the cell membrane.
D) None of these answers is correct.

Question

Quizplus · Accepted Answer

Protein hormones must bind to receptors on the cell membrane because they cannot enter the cell. They fit into the receptors based upon their specific shape, like a key in a lock.

What Is True About Protein Hormones