<prompt> Melanin is formed from which aminoacid?PhenylalanineTyrosineTryptophanHistidine  <response>: Ans. is b i.e., TyrosineAmino acidsBiological important compoundTyrosineCatecholamines epinephrine, norepinephrine, dopamine, thyroxine, triiodothryonine, melanin.Note : - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosine phenylalanine - Tyrosine - Catecholamines, thyroxine, T3 melanin.TryptophanVitamin niacin, melatonin, SerotoninGlycine, Arginine, methionineCreatineGlycine, cysteineBile saltsGlycineHemeAspartic acid and glutaminePyrimidine basesGlycine, aspartic acid, glutaminePurine basesb-alanineCoenzyme-AArginineNitric oxideHistidine, Arginine, lysineKeratinMethionine, lysineCarnitineGABAGlutamateGlutamate, cysteine, glycineGlutathione 