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Cellulose, the most important constituent of plant cell wall is made of

1. unbranched chain of glucose molecules linked by α-1, 4 glycosidic bond
2. branched chain of glucose molecules linked by β-1, 4 glycosidic bond in straight chain and α-1, 6 glycosidic bond at the site of branching
3. unbranched chain of glucose molecules linked by β-1, 4 glycosidic bond
4. branched chain of glucose molecules linked by α-1, 6 glycosidic bond at the site of branching

Correct answer: unbranched chain of glucose molecules linked by β-1, 4 glycosidic bond

Solution

Cellulose is a structural polysaccharide made of glucose units joined by β-1,4 glycosidic bonds, producing long straight chains. These chains pack tightly and form strong fibers, which is ideal for plant cell walls.

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