Homopolysaccharides fold in three dimensions. Thechair form of the pyranose ring is essentially rigid,so the conformation of the polymers is determinedby rotation about the bonds from the rings to theoxygen atom in the glycosidic linkage. Starch andglycogen form helical structures with intrachainhydrogen bonding; cellulose and chitin form long,straight strands that interact with neighboringstrands.
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