Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the thyroid hormones triiodothyronine (T3) and tetraiodothyronine (thyroxine or T4)?

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Physiology Test Question

Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the thyroid hormones triiodothyronine (T₃) and tetraiodothyronine (thyroxine or T₄)?

	(A) Alanine
	(B) Glutamic acid
	(C) Glutamine
	(D) Tyrosine
	(E) Tryptophan

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Posted: Saturday, January 23, 2016
Last updated: Saturday, January 23, 2016