Cellulose, the most important constituent of plant cell wall is made of                     [1998]

(a) Unbranched chain of glucose molecules linked by $\mathrm{\alpha }$ 1, 4-glycosidic bond

(b) Branched chain of glucose molecules linked by $\mathrm{\beta }$ 1, 4-glycosidic bond in straight chain and $\mathrm{\alpha }$, 1, 6-glycosidic bond at the site of branching

(c) Unbranched chain of glucose molecules linked by $\mathrm{\beta }$ 1, 4-glycosidic bond

(d) Branched chain of glucose molecules linked by $\mathrm{\alpha }$ 1, 6-glycosidic bond at the site of branching

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