Amino acid required for formation of thyroxine: (A) Tryptophan, (B) Tyrosine, (C) Glutamine, (D) Cysteine
Answer is B. Metabolic role of Tyrosine * Synthesis of thyroid hormones: Thyroxine (T4) and triiodothyronine (T3) * Synthesis of catecholamines * Synthesis of melanin pigment * Formation of tyramine * Formation of phenol and cresol * Formation of tyrosine-O-sulphateRef: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 497