Biomolecules and Chemistry in Everyday Life 1 Question 4
4. Amylopectin is composed of
(2019 Main, 10 April I)
(a) $\beta$-D-glucose, $\mathrm{C}{1}-\mathrm{C}{4}$ and $\mathrm{C}{2}-\mathrm{C}{6}$ linkages
(b) $\alpha$-D-glucose, $\mathrm{C}{1}-\mathrm{C}{4}$ and $\mathrm{C}{2}-\mathrm{C}{6}$ linkages
(c) $\beta$-D-glucose, $\mathrm{C}{1}-\mathrm{C}{4}$ and $\mathrm{C}{1}-\mathrm{C}{6}$ linkages
(d) $\alpha$-D-glucose, $\mathrm{C}{1}-\mathrm{C}{4}$ and $\mathrm{C}{1}-\mathrm{C}{6}$ linkages
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Solution:
- Amylopectin is the water-soluble component of starch. It is a branched-chain polymer of $\alpha$-D-glucose. The main chain consists of an $\alpha-1,4^{\prime}$ - glycosidic linkages between $\alpha$ - D- $\alpha$ - D- glucose units and the branches are connected to the main chain by $\alpha-1,6^{\prime}-$ glycosidic linkages. Its structure can be represented as:
