Match List-I with List-II

Choose the correct answer from the options given below:

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

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

Matching Breakdown

(A) Alanine $\rightarrow$ (I) $-CH_3$

Alanine is one of the simplest amino acids. Its R group is a basic methyl group.

(B) Lysine $\rightarrow$ (III) $H_2N-(CH_2)_4-$

Lysine is a basic amino acid. It features a long aliphatic chain ending in a primary amino group (butylamine side chain).

(C) Serine $\rightarrow$ (II) $HO-CH_2-$

Serine is a polar, uncharged amino acid. Its R group is a hydroxymethyl group, making it an alcohol.

(D) Cysteine $\rightarrow$ (IV) $HS-CH_2-$

Cysteine is unique because of its thiol (sulfhydryl) group. This allows it to form disulfide bridges in proteins.