Amino acids exhibit amphoteric behavior in aqueous solution due to the presence of both acidic (carboxyl group) and basic (amino group) groups, forming a dipolar ion or zwitterion. Naturally occurring a-amino acids, except glycine, are optically active due to the ...

Amino acids synthesizable in the body are termed non-essential, while those that cannot be synthesized and must be obtained from the diet are termed essential.

Amino acids are classified as acidic, basic, or neutral based on the relative number of amino and carboxyl groups in their molecules. Equal numbers result in neutrality, more amino groups make them basic, and more carboxyl groups make them acidic.

Amino acids are generally represented by both three-letter and one-letter symbols. Examples mentioned in the paragraph include glycine, tyrosine, and others, each with their corresponding structures and symbols.

Glycine is named for its sweet taste (glykos means sweet in Greek), and tyrosine is named as it was first obtained from cheese (tyros means cheese in Greek). Trivial names often reflect the properties or sources of the compounds.