Starch, glycogen and cellulose belong to the class of organic molecules ; Polysaccharides
Polysaccharide is a class of organic molecules made up of a chain of monosaccharides bonded by glyosidic bonds. this long chain of monosaccharides may be branched or not branched. also the chain of monosaccharides can be made up of different types and not a particular type of monosaccharide. examples of polysaccharides are starch and cellulose.
Hence given the structure of starch, glycogen and cellulose we can conclude that they belong to the class of organic molecules called Polysaccharides.
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