Final answer:
Amino acids are a group of neurotransmitters with specific receptors. Neuropeptides are neurotransmitter molecules made up of chains of amino acids connected by peptide bonds.
Step-by-step explanation:
Amino acids are a group of neurotransmitters that include glutamate, GABA, and glycine. These amino acids have specific receptors and do not interact with each other. They are eliminated from the synapse through reuptake.
Neuropeptides, on the other hand, are neurotransmitter molecules made up of chains of amino acids connected by peptide bonds. They can be short or long and often act as hormones in other systems of the body. Neuropeptides are released at synapses in combination with another neurotransmitter.