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Cellulose

AQA AS-level BiologyBiological MoleculesLesson 14 of 29

Cellulose is a structural polysaccharide found in plant cell walls. It is made of long chains of β-glucose monomers joined by β-1,4-glycosidic bonds.

There are two isomers of glucose, α-glucose and β-glucose, which differ in the position of the -OH group on carbon 1. In β-glucose this -OH group is above the ring, so to form 1,4-glycosidic bonds every other β-glucose molecule must be rotated by 180°.

Diagram

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