Starch consists of amylose and amylopectin. Amylose is a linear polymer of `alpha - D-` glucose while cellulose is a linear polymer of `beta - D-` glucose. In amylose, `C - 1` of one glucose unit is connected to `C - 4` of the other through `alpha`- glycosidic linkage. However in cellulose, `C - 1` of one glucose unit is connected to `C - 4` of the other through `beta -`glycosidic linkage. Amylopectin on the other hand has highly branched structure.
