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Chitin is a structural polysaccharide found in the fungal cell wall and the exoskeleton of arthropods.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Fungal cell wall provides rigidity, osmotic protection and shape differing chemically from plant cell wall. Major structural polysaccharide is chitin, polymer of beta-1,4-linked N-acetylglucosamine forming microfibrils crosslinked with beta-glucans and mannoproteins for strength. Chitin also occurs in arthropod exoskeletons, absent in plants which use cellulose. Cellulose predominates in oomycetes and plants, peptidoglycan in bacteria, silica in diatoms. Chitin synthesis via chitin synthases at hyphal tips confers resistance to microbial enzymes, serves as target for antifungal drugs like echi
Ref: Campbell Biology 12th ed., Chapter 31: Fungi Cell Wall Chitin; NCERT Class 11 Biology Chapter 2 Fungi; NCBI Medical Mycology
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