Identify an essential amino acid from the following:

Correct option is A

Ans. (a) Valine
Sol. Essential amino acids are those that cannot be synthesized by the human body and must be obtained from the diet. Valine is one of the nine essential amino acids, crucial for muscle metabolism, tissue repair, and nitrogen balance.
Explanation of each option:
(a) Valine – Correct answer. An essential amino acid required for protein synthesis.
(b) Glycine – Incorrect. A non-essential amino acid that the body can synthesize.
(c) Serine – Incorrect. A non-essential amino acid involved in metabolism and enzyme function.
(d) Proline – Incorrect. A conditionally essential amino acid that can be synthesized under normal conditions.