What characteristic feature distinguishes cellulose from starch and glycogen?

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Cellulose is a homopolymer of glucose, while starch and glycogen are not.

Cellulose forms complex helices that can hold iodine molecules, giving a blue color.

Only cellulose is used in the production of plant cell walls and cotton ﬁbres.

Cellulose is made of fructose monomers, while starch and glycogen are made of glucose.

answer is D.

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Detailed Solution

Only cellulose is used in the production of plant cell walls and cotton ﬁbres.

Starch forms helical secondary structures. In fact, starch can hold I₂ molecules in the helical portion. The starch-I₂ is blue in colour. Cellulose does not contain complex helices and hence cannot hold I₂.

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