Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?

In starch, α-glucose monosaccharides are present, while in cellulose, β-D-glucose monosaccharides are present. In starch and glycogen, α-glycosidic linkages link the units, while in cellulose, β-glycosidic bonds link the units.

Starch Cellulose Glucose

α-glucose monosaccharides are present β-D-glucose monosaccharides are present. Glucose itself is a monosaccharide.

α-glycosidic linkages link the units connecting the C1 of one unit and C4 of the next unit. β-glycosidic bonds link the units connecting the C1 of one unit and C4 of the next unit.