Identify the essential amino acids from the following.
(A) Threonine
(B) Serine
(C) Histidine
(D) Lysine
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A), (C) and (D) only
Essential amino acids are those that the human body cannot synthesize in sufficient quantity and must be obtained from diet.
Option-wise Explanation
(A) Threonine
Essential amino acid. Needed for protein balance and immune function.
(B) Serine
Non-essential amino acid. The body can synthesize it from other metabolites (like glycine).
(C) Histidine
Essential amino acid (especially important during growth and for hemoglobin formation).
(D) Lysine
Essential amino acid. Important for growth, tissue repair, and enzyme production.