<prompt> Amino acid required for formation of thyroxine-TryptophanTyrosineGlutamineCysteine  <response>: Ans. is b i.e.. Tyrosine o The term thyroid hormone denotes both thyroxine T4 and triodothyronine T3.o Both T4 and T are iodine derivatives of thyronine.o Thyronine is a condensation product of two molecules of amino acid tyrosine.o Thyroxine is 3, 5, 3, 5 - tetraiodothvronineandT, is 3,5,3-triiodothyronine.o Thyroid hormones are synthesized and stored in the thyroid follicles as apart of thyroglobulin molecule. 