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What is the chemical difference between cellulose and chitin?

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What is the chemical difference between cellulose and chitin?

(a) Replacement of the hydroxyl group at C2 with an acetylated amino group

(b) Replacement of the hydroxyl group at C3 with an acetylated amino group

(c) Replacement of the hydroxyl group at C4 with an acetylated amino group

(d) Replacement of the hydroxyl group at C5 with an acetylated amino group

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Asked question is from Polysaccharides in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry

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Correct choice is (a) Replacement of the hydroxyl group at C2 with an acetylated amino group

For explanation: Chitin is a linear homopolysaccharide composed of N-acetylglucosamine residues in β linkage.

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