A fungal cell wall contains structural polysaccharides including chitin and glucans. Its composition and organization vary among fungi; the diagram illustrates a composite rather than a pure chitin shell. A fungus sharing a cell wall with a plant does not imply shared wall chemistry.[ref]
24.1 Characteristics of Fungi. Biology 2e, §24.1, Cell Structure and Function: structural wall polysaccharides
Chitin is a structural polysaccharide built from modified sugar units. It contributes reinforcement to a fungal cell wall.
A glucan is a polysaccharide built from glucose units. Different linkages produce different structures; some glucans contribute to a fungal cell wall.
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