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Which of the following is an amino acid? 1.Cysteine 2. Histidine3.Proline 4. Glycine Choose the correct answer from the options given below:
Question

Which of the following is an amino acid?
1.Cysteine 2. Histidine3.Proline 4. Glycine
Choose the correct answer from the options given below:

A.

1 and 2 only

B.

1, 2, and 3 only

C.

2, 3, and 4 only

D.

1, 2, 3, and 4

Correct option is D


All four — Cysteine, Histidine, Proline, and Glycine — are naturally occurring amino acids. They contain an amino group (-NH₂) and a carboxyl group (-COOH) and are part of protein structures in living organisms. Hence, the correct answer is all of the above.

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