Question

Which of the following statements is not true about thyroxine?

• A. Iron is essential for the synthesis of thyroxine
• B. It regulates carbohydrate, protein and fat metabolism in the body
• C. Thyroid gland requires iodine to synthesise thyroxine
• D. Thyroxine is also called thyroid hormone

Answer 1

The correct option is A Iron is essential for the synthesis of thyroxine

Iodine is the essential element required for the proper functioning of thyroxine hormone which is produced by the thyroid gland. In the absence of iodine element, the gland will not function properly and the deficiency of thyroxine will thus result in a disease called as "goitre". The thyroid hormones also known as thyroxine are tyrosine-based hormones produced by the thyroid gland that is primarily responsible for regulation of carbohydrates, protein and fat metabolism. Iodine is necessary for the synthesis of thyroxine.

Therefore, the correct answer is option A.