A .  
carry polar molecules across the cell membranes
B .  
carry message between two neurons or between neurons and muscles
C .  
carry genetic information from one cell to the other
D .  
act as structural material for the cell membranes
Answer: Option B : B In the body, message between two neurons and that between neurons to muscles is communicated through certain chemicals. These chemicals, known as chemical messengers are received at the binding sites of receptor proteins.
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