Question

One of essential \( \alpha \)-amino acids is:

• A. \( \text{Lysine} \)
• B. \( \text{Serine} \)
• C. \( \text{Glycine} \)
• D. \( \text{Proline} \)

Hint:

Essential amino acids cannot be synthesized by the body and must be consumed through diet.

Answer 1

The Correct Option is A

using a step-by-step method to emphasize the categorization of amino acids:
Step 1: Definition of Essential Amino Acids Essential amino acids are those that cannot be synthesized by the human body. These amino acids must be obtained from the diet, as they are crucial for various biological functions, including protein synthesis. Step 2: Categorization of the Given Amino Acids
Let's evaluate each of the given amino acids:
Lysine is an essential amino acid. The body cannot produce it, so it must be consumed through food.
Glycine is a non-essential amino acid, as it can be synthesized by the body from other precursors.
Serine is also a non-essential amino acid because it can be synthesized in the body from other compounds.
Proline is considered a non-essential amino acid, as it can be synthesized by the body from glutamate.
Conclusion: Among the listed amino acids, Lysine is the only essential one. Therefore, the correct answer is: \[ \boxed{\text{Lysine}} \]