Biology – Carbohydrates and lipids | e-Consult

Cellulose is a linear polysaccharide composed of repeating units of glucose molecules. Each glucose molecule is in an alpha (α)-D-glucopyranose conformation. The monosaccharides are linked together by β(1→4) glycosidic bonds. This means the hydroxyl group on the C1 carbon of one glucose molecule bonds with the C4 carbon of the next, with the linkage occurring on the opposite side of the carbon chain compared to an α(1→4) linkage. This specific linkage is crucial for cellulose's structure and properties. The repeating glucose units are extended along the polysaccharide chain, creating a linear structure. The absence of α-1,6 glycosidic bonds (which would create branches) is also important. This linear structure allows for effective hydrogen bonding between adjacent chains.