To which major category of biological molecules does chitin belong?

The major category of biological molecules to which chitin belong is Carbohydrates because chitin is used for structural support in the insect’s external skeleton. The correct option is D.

What is Chitin?

Chitin is a complex carbohydrate that is made up of amino sugars. It comes under carbohydrates and under this is in the polysaccharide category.

It is a large structure and is made up of large chains of glucose. Furthermore, it makes the exoskeletons of many insects and invertebrates, it is very hard and provides structural support.

Thus, the correct option is D, Carbohydrates.

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The question is incomplete. Your most probably complete question is given below:

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