What is glycogen? How is it different from starch?

Explanation

Strach is not a single compound but is a mixture of two components: a water soluble component called amylose `(15-20%)` and a water insoluble component called amylopectin `(85-80%)`. Amylose is a linear polymer of `alpha-D-`glucose. Both glycogen and amylopectin are branched polymers of `alpha-D-`glucose. However, glycogen is more highly branched than amylopectin. Whereas, amylopectin chains consist of `20-25` glucose units, glycogen chains consist of `10-14` glucose units.