GS PrelimsScience and TechnologyHuman Health and Diseases1995

Which one of the following hormones contains iodine?

Thyroxine

Testosterone

Insulin

Adrenaline

Correct Answer: Option A

Explanation

1. The question asks which of the listed hormones contains iodine. 2. Hormones are chemical messengers produced by the endocrine system. 3. Thyroxine (T4) is one of the main hormones produced by the thyroid gland. Its synthesis is critically dependent on the availability of dietary iodine. The thyroxine molecule itself incorporates four atoms of iodine. 4. Testosterone (a steroid hormone), Insulin (a peptide hormone), and Adrenaline (epinephrine, an amine hormone) are essential hormones, but their chemical structures do not contain iodine.

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