The basic structural difference between starch and cellulose is of linkage between the glucose units. In starch, there is a-D-glycosidic linkage. Both the components of starch-amylose and amylopectine are polymer of a-D-glucose. On the other hand, cellulose is a linear polymer of b-D-glucose in which C1 of one glucose unit is connected to C4 of the other through b-D-glycosidic linkage.