Amylose is a long unbranced chain of $\alpha$-D-glucose units held by $\mathrm{C}_1 - \mathrm{C}_4$ glycosidic linkage whereas amylopectin is a branched chain polymer of $\alpha$-Dglucose units, units in which chain is formed by $\mathrm{C}_1 - \mathrm{C}_6$ glycosidic linkage while branching occurs by $\mathrm{C}_1 - \mathrm{C}_6$ glycosidic linkage. OR Glucose + Galactose