Which of the following is a non-essential amino acid?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Proline
Proline carries no asterisk in Table 10.2, so the body can make it: it is a non-essential amino acid.
NCERT (2026-27 edition):
10.2.2 Classification of Amino Acids – “… The amino acids, which can be synthesised in the body, are known as non-essential amino acids. On the other hand, those which cannot be synthesised in the body and must be obtained through diet, are known as essential amino acids (marked with asterisk in Table 10.2).”
Table 10.2: Natural Amino Acids
