What is the basic structural difference between starch and cellulose?

Both starch and cellulose contain a large number of D(+) glucose units. Starch consists of two
components (a) amylose, which is a linear polymer and (b) amylopectin which is a branched polymer, but in both the $\mathrm{\alpha }$ -D-glucose units are linked through $\mathrm{\alpha }$ -glycosidic linkage between C₁ of one glucose with C₄ of next glucose unit. Cellulose is only a linear polymer of $\mathrm{\beta }$ -D-glucose units joined through $\mathrm{\beta }$ - glycosidic linkage between C₁ of one glucose with C₄ of next glucose unit.