The chitinous exoskeleton of arthropods is formed by polymerization of:
The chitinous exoskeleton of the insects is the result of the polymerization of N-acetyl glucosamine, which is a derivative of glucose It is also a characteristic component of the cell wall of fungi, the radulae of molluscs, and the beaks and internal shells of cephalopods including squid and octopuses. So, the correct answer is ‘N-acetyl glucosamine.'