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Polysaccharides are long chains of many monosaccharides joined together by glycosidic

There are three important polysaccharides:


Is the plant storage polysaccharide. It is insoluble and forms starch granules inside many
plant cells. Being insoluble means starch does not change the water potential of cells, so does

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Is only found in plants, where it is the main component of cell walls. It is poly (1-4) glucose,
but with a different isomer of glucose. Cellulose contains beta-glucose, in which the hydroxyl
group on carbon 1 sticks up. This means that in a chain alternate glucose molecules are

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Polysaccharide Function: Structure: Relationship of
: structure to function:
Starch Main storage Made of 2 polymers amylose and Insoluble therefore
polysaccharide amylopectin. good for storage.
in plants.
Amylose: a polymer of glucoses Helix is compact.
joined by 1,4glycosidic bonds.
Forms a helix with 6 glucose The branches mean
molecules per…


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