Question

drugs that bind to a receptor and mimic the effects of the neurotransmitter that normally fits into that receptor are called _____.
agonists
pheromones
antagonists

Explanation:

Agonists are drugs that bind to a receptor and mimic the effects of the neurotransmitter that normally binds to that receptor. Pheromones are chemical signals between animals and not related to this drug - receptor action. Antagonists bind to receptors but block or inhibit the normal effects, not mimic them.

Answer:

agonists