Which molecule in this figure portraying water-soluble hormone action is the receptor protein?
A) molecule A
B) molecule B
C) molecule C
D) molecule D

Question

Which molecule in this figure portraying water-soluble hormone action is the receptor protein? 
A) molecule A 
B) molecule B 
C) molecule C 
D) molecule D

Quizplus · Accepted Answer

Molecule B represents the receptor protein, as it is the only molecule in the figure with a specific receptor site where the hormone (molecule A) binds. Molecule C represents the effector protein, which changes its activity in response to the hormone-receptor complex. Molecule D is the intracellular signaling molecule that transmits the signal from the effector protein to the target cell's response.

Which Molecule in This Figure Portraying Water-Soluble Hormone Action Is