Chitin is a polysaccharide found in the exoskeleton of insects. The diagram below shows a chitin monomer.

To which major category of biological molecules does chitin belong?

proteins, because chitin forms the flexible joints of an insect’s shell

nucleic acids, because chitin provides the blueprint for insect body plans

lipids, because chitin serves as an insect’s insulation from their environment

carbohydrates, because chitin is used for structural support in the insect’s external skeleton

Chitin is a polysaccharide found in the exoskeleton of insects. carbohydrates is the chitin monomer, because chitin is used for structural support in the insect’s external skeleton. Hence Option D is correct.

What is chitin?

Chitin is a large structural polysaccharide found in the exoskeletons of insects, cell walls of fungi, and some in invertebrates.

This versatile molecule are observed in insect wings, mixed with with calcium carbonate to make a shell of a clam.

Chitin and cellulose are composed up glucose monomers but keratin is a fibrous protein.

Structurally Chitin is different from cellulose by the replacement of hydroxyl group (OH) with amyl group attached which have carbon and nitrogen in glucose monomer.

Due to its biodegradability, it is used in most of the industries, in medical application, dyes, glues etc.

Hence Option D is correct.

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