<prompt> Gamma amino butyrate is synthesized from? -FumarateGlutamateHistidineGlycine  <response>: Ans. is b i.e., Glutamate Ref: Harper 29th e p. 304-305o Gamma amino butyric acid GABA is formed by decarboxylation of L-glutamate.Amino acidsBiological important compoundTyrosineCatecholamines epinephrineQ, norepinephrineQ, dopamineQ, thyroxineQ, triiodothryonine, melanin Q.Note: - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosine phenylalanine - TyrosineQ - CatecholaminesQ, thyroxineQ, T3, melaninQ.TryptophanVitamin niacinQ, melatoninQ, SerotoninQGlycineQ,ArginineQ,methionineQCreatineQGlycine, cysteineBile saltsGlycineHeme.Aspartic acid andglutaminePyrimidine basesGlycineQ, aspartic acid, glutaminePurine basesQb-alanineCoenzyme-AArginineNitric oxideQGlutamateGama-amino butyric acid GABA 