The Significance of Plasma Membrane Receptors for Chemical Regulators Such

The significance of plasma membrane receptors for chemical regulators such as hormones and neurotransmitters is that

A) They allow the regulators to affect cell functions while preventing them from entering into the cell's cytoplasm
B) They permit nonpolar chemical messengers to affect cell functions
C) They allow for signal amplification or a multiplier effect of the message
D) Both they allow the regulators to affect cell functions while preventing them from entering into the cell's cytoplasm and they permit nonpolar chemical messengers to affect cell functions are correct
E) All of the choices are correct