Q.How many types of polysaccharides you know?

Both are glucose polymers, but cellulose uses β-linked glucose in unbranched chains, while glycogen uses α-linked glucose with heavy branching.

Cellulose:

• Monosaccharide unit: β-D-glucose.
• Linkage: β-1,4-glycosidic bonds joining consecutive glucose units.
• Structure: purely linear, unbranched chains, which pack together via extensive hydrogen bonding into strong fibres — the main structural component of plant cell walls.

Glycogen:

• Monosaccharide unit: α-D-glucose.
• Linkage: a main chain of α-1,4-glycosidic bonds, with additional α-1,6-glycosidic bonds creating branch points roughly every 8–12 units. …