Q.Glycosidic bond is found in ---------------.

Repeated condensation of monosaccharide units, one after another, builds a very large polymer called a polysaccharide — the process is called polymerisation, and it is reversed by hydrolysis back into monosaccharides. A polysaccharide's properties (solubility, strength) depend on its chain length, branching, folding and coiling.

• Starch — the plant's reserve food; built from α-glucose in two forms, unbranched helical amylose and branched, water-insoluble amylopectin.
• Glycogen — the animal storage carbohydrate (liver, muscle); essentially amylopectin with more closely spaced branches.
• Cellulose — a straight-chain polymer of β-glucose that forms the plant cell wall, its toughness coming from chain packing and extensive hydrogen bonding between chains.

Polysaccharides are also classed as homopolysaccharides (one type of monosaccharide — starch, cellulose, glycogen) or heteropolysaccharides (more than one type — e.g. hyaluronic acid, heparin, chondroitin sulphate, the blood-group substances).