NEET Zoology Biomolecules Questions Solved

In which of the following groups, all the three are examples of polysaccharides?                        [1996]

(a) Starch, glycogen, cellulose

(b) Sucrose, maltose, glucose

(c) Glucose, fructose, lactose

(d) Galactose, starch, sucrose 

(a) Starch and glycogen are storage polysaccharide and cellulose is a structural polysaccharide. Starch has straight chain of 1,4 α-D pyranose glucose units and side chains or amylopectin part of 2-200 thousand glucose units that are attached to straight chains by 1,6 α-D glycosidic bonds.

Glycogen is a long chain branched polymer of 5-300 thousand glucose units, straight chain linked by α-D 1-4 glycosidic bonds and side chains through α-D 16 glycosidic bonds.  

Cellulose, a fibrous polysaccharide has a linear chain of 6-10 thousand 14 linked β-pyranose glucose chain.

Difficulty Level:

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