Though both starch and cellulose are composed of repeating glucose units, the main difference between them is that:
(a) they are bonded by 1-6 and 1-4 glycosidic linkages respectively.
(b) they differ in the α and β configuration.
(c) most of the fruits and grains are rich in starch and poor in cellulose or fiber.
(d) starch is made of simple sugars while cellulose is made of amino sugars.
(b) they differ in the α and β configuration.