JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Biomolecules

Amylopectin is composed of

(A) $α$ -D-glucose, $C_{1} - C_{4}$ and $C_{2} - C_{6}$ linkages
(B) $β$ -D-glucose, $C_{1} - C_{4}$ and $C_{2} - C_{6}$ linkages
(C) $α$ -D-glucose, $C_{1} - C_{4}$ and $C_{1} - C_{6}$ linkages✓ Correct
(D) $β$ -D-glucose, $C_{1} - C_{4}$ and $C_{1} - C_{6}$ linkages

Answer: (C)

Solution

Amylopectin is the branched component of starch, a homopolymer of

α

-D-glucose. Its straight runs are joined by

α (1 \to 4)

glycosidic linkages while the branch points are

α (1 \to 6)

linkages. This branching is what sets it apart from amylose, which has only

α (1 \to 4)

links and no branches.

JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Single correct option

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