What is the basic structural difference between starch and cellulose ?

Explanation

In cellulose a straight chain polysaccharide composed only of `beta-D` - glucose units which are joined by glycosidic linkage between C-1 of one glucose unit and C-4 of the next glucose unit. Starch consists of two components - Amylose and Amylopectin. Amylose is a long unbranched chain with 200 - 1000 `alpha - D -` glucose units held by C - 1 to C - 4 glycosidic linkage. Amylopectin is a branched chain polymer of `alpha` - D - glucose units in which chain is formed by C - 1 to C - 4 glycosidic linkage where as branching occurs by C - 1 to C - 6 glycosidic linkage