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Solution


Q.

The chitinous exoskeleton of arthropods is formed by the polymerisation of         [2015]
1 N-acetyl glucosamine  
2 lipoglycans  
3 keratin sulphate and chondroitin sulphate  
4 D - glucosamine.  

Ans.

(1)

Chitin is a structural polysaccharide that constitutes the exoskeleton of arthropods. It is a complex carbohydrate in which N-acetyl glucosamine monomers are joined together by (1, 4) β-linkages. Chitinous exoskeleton provides strength and elasticity to arthropods.