Match the amino acid given in List-I with their one letter code given in List-II
|
List-I Name of amino acid |
List-II One letter code |
|
(A) Lysine |
(I) W |
|
(B) Tryptophan |
(II) Q |
|
(C) Tyrosine |
(III) K |
|
(D) Glutamine |
(IV) Y |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Each amino acid has a three-letter symbol and a one-letter code. Many codes are the first letter (G for glycine, S for serine), but where two amino acids share a first letter, the others get a different letter, often one that sounds like the name.
(A) Lysine — This matches (III) K. L is already taken by leucine, so lysine is K (the letter next to L).
(B) Tryptophan — This matches (I) W. T is threonine; tryptophan, with its double ring, is W (“tWo rings”).
(C) Tyrosine — This matches (IV) Y. T is taken, so tyrosine uses the second letter of its name, tYrosine.
(D) Glutamine — This matches (II) Q. G is glycine, so glutamine is Q (“Q-tamine”).
Shortcut: Lysine = K appears in Options (2) and (4); Tryptophan = W then leaves only Option (2).
NCERT (2026-27 edition):
Amino Acids – …
