Question

The immediate precursor of thyroxine is

• A. tyrosine
• B. tryptophan
• C. pyridoxine
• D. thymidine

Answer 1

Answer: (A)

Tyrosine is the immediate precursor of the thyroxine hormone. Thyroxine is produced in the thyroid gland from tyrosine and iodine. Thyrotropin Releasing Hormone (TRH) is produced by the hypothalamus which induces the release of thyroxine