the primary structure of a protein is the first layer of a protein molecule's three dimensional structure and determines all chemical interactions

The receptor is a protein molecule that accepts the chemical signals sent from the neurotransmitter

polypeptides are chains of amino acids that exceed 100 links.

The peptide bonds are bonds that connect chains of amino acids together. The dipeptides are formed when two amino acids are connected by their carboxyl and amino groups

amino acids are the monomers of proteins and essential amino acids are amino acids that the body cannot make and has to consume in food

amino groups are functional groups that are only found in protein molecules.

The functional groups are all connected to the central alpha carbon

secondary structure is created during protein synthesis and tertiary structure forms when the R groups interact and form hydrogen bonds.

R groups are side chains that give the protein molecules distinct characteristics and functions. They serve as functional groups.