Question

Identify the polysaccharide with $\beta$ - glycosidic bond

• A. Starch
• B. Glycogen
• C. Sucrose
• D. Cellulose

Answer 1

The correct option is D Cellulose

• Starch is a homopolysaccharide of D-glucose and contains two types of glucose polymer, amylase, and amylopectin.
• The long, unbranched chains of D-glucose residues connected by alpha 1,4 linkages are termed amylase.
• The branched polymer of glucose wherein alpha 1,4 glycosidic linkages join successive glucose with branch points having alpha 1,6 linkages.
• Glycogen is also a homopolysaccharide of D-glucose that differs from starch in being highly branched (every 8-12 residues as compared to the presence of branches in starch for every 24-30 residues) but carries the same bonding pattern. This makes options A and B incorrect.
• Starch is a polymer of glucose, wherein glucose residues are linked together by alpha-1,4 glycosidic linkage. This makes option C incorrect.
• Cellulose is a linear homopolysaccharide of D-glucose units, which are linked together by beta-1,4 glycosidic bonds. This makes option D the correct answer.