Question

Observe the following amino acids: 

• A. Both I, II are essential amino acids
• B. Both I, II are non-essential amino acids
• C. I is essential amino acid, II is non-essential amino acid
• D. I is non-essential amino acid, II is essential amino acid

Hint:

Essential amino acids cannot be synthesized by the body and must be obtained through diet. Non-essential amino acids, like serine, can be synthesized internally.

Answer 1

The Correct Option is C

1. Amino Acid I (Left Structure): The structure represents Leucine, which has a branched hydrocarbon side chain. Leucine is an essential amino acid, meaning it must be obtained from the diet.

2. Amino Acid II (Right Structure): The structure represents Serine, which contains a hydroxyl (-OH) group. Serine is a non-essential amino acid, meaning the body can synthesize it.

Thus, Amino Acid I (Leucine) is essential, and Amino Acid II (Serine) is non-essential, making option (3) the correct choice.