Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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What is Glycogen? How is It Different from Starch? - Chemistry

What is glycogen? How is it different from starch?

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Solution 1

Glycogen is a carbohydrate (polysaccharide). In animals, carbohydrates are stored as glycogen.

Starch is a carbohydrate consisting of two components − amylose (15 − 20%) and amylopectin (80 − 85%).

However, glycogen consists of only one component whose structure is similar to amylopectin. Also, glycogen is more branched than amylopectin.

Solution 2

Glycogen is a condensation polymer of α-D glucose. Starch is not a single compound but is a mixture of two components—a water soluble component called amyldse (15- 20%) and water insoluble component amylopectin (80 – 85%). Amylose is a linear polymer of α – D – glucose. But both glycogen and amylopectin are branched polymers of α – D – glucose; father glycogen is more highly branched than amylopectin as amylopectin chains consists of 20 – 25 glucose units, glycogen chains consist of 10 – 14 glucose units.

Concept: Carbohydrates - Polysaccharides - Starch, Cellulose and Glycogen
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NCERT Class 12 Chemistry Textbook
Chapter 14 Biomolecules
Q 6 | Page 423
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