Which of the following is not an essential amino acid?
Biomolecules · Class 12 · JEE Main Previous Year Question
Which of the following is not an essential amino acid?
- a✓
Tyrosine
- b
Valine
- c
Lysine
- d
Leucine
Tyrosine
Step 1: Defining Essentiality — Essential amino acids cannot be synthesized by the human body and must be supplied by the diet.
Step 2: Categorizing the Options — Valine, Lysine, and Leucine are all essential amino acids. Tyrosine can be synthesized from phenylalanine.
Step 3: Identification — Because tyrosine can be produced internally, it is classified as a non-essential amino acid. Correct option is (a).
Key Point: There are 10 commonly recognized essential amino acids (e.g., Phenylalanine, Valine, Tryptophan, Threonine, Isoleucine, Methionine, Histidine, Arginine, Leucine, Lysine).
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