This document discusses the reactions and color tests of amino acids. It describes reactions that can occur due to the amino group, carboxyl group, or both including oxidative deamination, transamination, and peptide bond formation. Reactions involving the side chains of different amino acids like ester formation, disulfide bond formation, and transmethylation are also reviewed. Finally, the document outlines several common color tests used to identify different amino acids including the ninhydrin, biuret, xanthoproteic, Millon's, Sakaguchi, Hopkins Cole, lead acetate, and nitroprusside reactions. The learner will understand the various reactions and color tests used to analyze amino acids.