What is the fibrous substance that makes up most of the exoskeleton or outer body protection of insects and spiders?
The fibrous substance that makes up most of the exoskeleton of insects and spiders is called chitin. Chitin is a polysaccharide, a long chain of sugar molecules, that is also found in the cell walls of fungi and the beaks of cephalopods. In insects and spiders, chitin is produced by specialized cells called epidermal cells, which secrete it onto the surface of the body. The chitin hardens and forms a protective exoskeleton that protects the insect or spider from predators, parasites, and desiccation. The exoskeleton also provides support for the body and allows for movement.
In addition to chitin, the exoskeleton of insects and spiders may also contain other substances, such as proteins, lipids, and minerals. The composition of the exoskeleton can vary depending on the species of insect or spider.
Related Questions
- What is the main function of the exoskeleton? Protection, support, and movement.
- What type of molecule is chitin? Polysaccharide
- Where is chitin also found in nature? Fungal cell walls and cephalopod beaks
- Who produces chitin in insects and spiders? Epidermal cells
- What other substances may be present in the exoskeleton? Proteins, lipids, and minerals
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