Multiple choice

Which of the following hormones contains Iodine?

  1. Insulin

  2. Thyroxin

  3. Testostrene

  4. Adrenaline
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thyroxine (T4) contains iodine atoms in its molecular structure: specifically four iodine atoms, which is why it's called T4. The thyroid gland requires iodine to synthesize thyroxine and triiodothyronine (T3). Insulin is a protein hormone made of amino acids, testosterone is a steroid hormone, and adrenaline is a catecholamine; none contain iodine.

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