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Comparing the structure and function of polysaccharides Polysaccharides are polymers whose subunits are monosaccharide. They are made by joining many monosaccharide (single sugar molecule) molecules together by the process of condensation. Each successive monosaccharide is added by means of a glycosidic bond. A final molecule may be several thousand monosaccharide units long, this forms a macromolecule. The three most important polysaccharides are starch, glycogen and cellulose. All of these are polymers of glucose and polysaccharides are not sugars. Glucose is the main source of energy for living organisms so it is important to store it in an appropriate form. If this glucose accumulated in cells, it would dissolve which would result in the cells becoming too concentrated. This would affect the cells osmotic properties and also would interfere with normal cell chemistry as glucose is a reactive molecule. This problem is avoided by converting (by condensation reactions) to a storage polysaccharide....

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