The answer to this question would be: <span>B. Receptor site
The receptor site of a neurotransmitter often only receives a specific kind of transmitter. That was because the receptor has a unique 3D structure, so different transmitter wouldn't fit into the receptor. That was similar to lock and key principles.</span>
Answer:
During active transport, a protein pump uses energy, in the form of ATP, to move molecules from an area of low concentration to an area of high concentration.
Explanation:
Mark's best plan of action would be to walk to where his girlfriend is two blocks away and drive her home.
I think the answer is A. it doesn't make sense
Damage to reproductive system
