You have been given an unknown neurotransmitter to identify. What characteristics would indicate that it is more likely a small-molecule neurotransmitter?
A) it causes ion channels to open or close
B) it alters the strength of the post-synaptic cell response
C) it affects the synthesis of neurotransmitter in the presynaptic cell
D) it has long lasting effects

Question

Quizplus · Accepted Answer

Small-molecule neurotransmitters are typically released from the presynaptic cell and bind to ionotropic receptors on the postsynaptic cell, causing ion channels to open or close and rapidly altering the strength of the post-synaptic response. Choices B, C, and D are not specific to small-molecule neurotransmitters and could apply to other types of neurotransmitters as well.

You Have Been Given an Unknown Neurotransmitter to Identify