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Q.

What characteristic feature distinguishes cellulose from starch and glycogen?

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a

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

b

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

c

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

d

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

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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