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JEE Main · 2026 · 02 Apr 2026 · Shift 2 · Biomolecules

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Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A).
( T and Y represent one letter code for amino acids)
  1. (A)Amino acid (A): T, Hormone (B): Insuline
  2. (B)Amino acid (A): T, Hormone (B): Thyroxine
  3. (C)Amino acid (A): Y, Hormone (B): Thyroxine✓ Correct
  4. (D)Amino acid (A): Y, Hormone (B): Insuline

Answer: (C)

Solution

The thyroid hormone thyroxine is formed by iodination of the aromatic amino acid tyrosine, four iodine atoms being introduced across its two phenolic rings. Insulin, by contrast, is a polypeptide and not an iodinated amino acid derivative. The one-letter code for tyrosine is Y, so the amino acid is Y and the hormone is thyroxine.

JEE Main · 2026 · 02 Apr 2026 · Shift 2 · Single correct option

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