Match the amino acid given in List-I with their one letter code given in List-II

Choose the correct answer from the options given below:

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

The correct answer is Option (2) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

(A) Lysine $\to$ (III) K

Since 'L' was already taken by Leucine, Lysine is assigned K. A common mnemonic is that 'K' is the letter near 'L' in the alphabet.

(B) Tryptophan $\to$ (I) W

Tryptophan has a double-ring structure and is the bulkiest amino acid. It is assigned W, which can be remembered because of the "tw" sound in Tryptophan (Tw-yptophan).

(C) Tyrosine $\to$ (IV) Y

Tyrosine uses its second letter, Y, as its code because 'T' is used for Threonine.

(D) Glutamine $\to$ (II) Q

Glutamine is assigned Q. A helpful way to remember this is the phonetic sound "Q-tamine."