Match List-I with List-II
| List-I | List-II |
| Biomolecules | Functions / structural feature |
| (A) Sucrose | (I) Non-reducing sugar |
| (B) Amylopectin | (II) Vitamin A |
| (C) Secondary structure of proteins | (III) C1-C6 glycosidic linkage |
| (D) Xerophthalmia | (IV) Hydrogen bonding |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A) - (I), (B) - (III), (C) - (IV), (D) - (II)
Each item in List-I is linked to one defining property of a biomolecule: the reducing nature of a sugar, the linkage in a polysaccharide, the bonding that holds a protein structure, and a vitamin deficiency.
(A) Sucrose — This matches (I) Non-reducing sugar. In sucrose, C1 of α-glucose is joined to C2 of β-fructose. Both reducing groups are used in the glycosidic bond, so sucrose does not reduce Tollens’ reagent or Fehling’s solution.
(B) Amylopectin — This matches (III) C1-C6 glycosidic linkage. Amylopectin is the branched part of starch. Its chain is formed by C1–C4 glycosidic linkages, and the branches are formed by C1–C6 glycosidic linkages.
(C) Secondary structure of proteins — This matches (IV) Hydrogen bonding. The α-helix and the β-pleated sheet are held by hydrogen bonds between the >C=O and –NH– groups of peptide bonds.
(D) Xerophthalmia — This matches (II) Vitamin A. Deficiency of vitamin A causes xerophthalmia (hardening of the cornea) and night blindness.
Shortcut: The pair (C)–(IV) appears only in Option (4).