Fungi show a great diversity in morphology and habitat: Fungi are cosmopolitan, found in air, water, soil, and on living or dead matter. Their forms range from unicellular yeasts to multicellular mushrooms and filamentous molds.

Cell wall of fungi is composed of chitin and polysaccharides: Unlike plant cell walls (cellulose), fungal cell walls are primarily made of chitin (a polymer of N-acetylglucosamine) and various polysaccharides.

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