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Chitin is a structural heteropolysaccharide found in the fungal walls as fungus cellulose and as chitin in the exoskeloton of arthropods. Collagen is the most abundant protein in animal world while RuBisCo is the most abundant protein in the whole of the biosphere. In a polysaccharide, the individual mono-saccharides are linked by a glycosidic bond. Phosphodiester bonds help in polymerization of nucleotides to form polynucleotide.

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