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Chemistry Question 69 – JEE-MAIN 2026

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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) Amino acid (A) Hormone (B)

Consider the chemical nature and precursor of the hormones listed in the options.

Step 1: Identify the Amino Acids and Hormones✦ Active

The one-letter codes for amino acids are: 'T' represents Threonine, and 'Y' represents Tyrosine. The hormones listed are Insulin and Thyroxine.

Step 2: Determine the Nature of Hormones○ Expand

Insulin is a peptide hormone, not an iodinated derivative of a single amino acid. Thyroxine (also known as T4) is a thyroid hormone that is an iodinated derivative of the amino acid Tyrosine.

Step 3: Match Amino Acid to Iodinated Derivative○ Expand

Since Thyroxine is an iodinated derivative of Tyrosine, the correct pair is the amino acid Tyrosine (Y) and the hormone Thyroxine. This corresponds to option 3.

💡 Teacher's Secret Hint

Remember that thyroid hormones are unique in their iodine content and amino acid origin.

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