Question

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A).} Choose the correct answer from the options given below:

• A. T - Insulin
• B. T - Thyroxine
• C. Y - Thyroxine
• D. Y - Insulin

Answer 1

The Correct Option is C

In this question, we are asked to identify the correct pair of amino acid (A) and hormone (B) where the hormone is an iodinated derivative of the amino acid. 1. Amino acid and hormone relationship:
- The amino acids are the building blocks of proteins, and certain amino acids also serve as precursors to hormones. Some hormones, particularly thyroid hormones, are derived from amino acids and undergo iodination, which is the addition of iodine atoms to the structure.
2. Thyroxine (T):
- The iodinated derivative of the amino acid tyrosine is thyroxine (T). Thyroxine is a hormone produced by the thyroid gland, and it plays an essential role in regulating metabolism and growth. - The chemical structure of thyroxine is derived from the amino acid tyrosine, with iodine atoms added to it. Hence, tyrosine (Y) is the amino acid that is iodinated to form thyroxine.
3. Insulin (Y):
- Insulin, on the other hand, is a peptide hormone made from a sequence of amino acids, specifically consisting of two polypeptide chains. It is not derived from an iodinated amino acid. Therefore, insulin cannot be an iodinated derivative of any amino acid.
4. Analysis of the options:
- (A) T - Insulin: Incorrect. Insulin is not an iodinated derivative of any amino acid.
- (B) T - Thyroxine: Incorrect. While thyroxine is indeed derived from tyrosine (and thus could be represented by T), the pair involving T is incorrect for the specific iodinated version. T here is just used as a placeholder for the amino acid.
- (C) Y - Thyroxine: Correct. Tyrosine (Y) is iodinated to form thyroxine (T). This is the correct pair.
- (D) Y - Insulin: Incorrect. Insulin is not derived from an iodinated amino acid.
5. Conclusion: - Based on the chemical structure of thyroxine and insulin, and the understanding that tyrosine is the amino acid involved in the formation of iodinated thyroxine, the correct answer is (C) Y - Thyroxine.
Final Answer: Y - Thyroxine