NEET Zoology Biomolecules Questions Solved

Which one of the following is a non-reducing carbohydrate?                                [2014]

(a) Maltose

(b) Sucrose

(c) Lactose

(d) Ribose-5-phosphate

(b) Sucrose is a disaccharide of glucose and fructose. It is a non-reducing sugar as it do not contain any free anomeric carbon atom. Maltose is a disaccharide of 2 glucose units. Its first glucose residue cannot undergo oxidation, whereas, second residue can undergo oxidation because it has a reactive free anomeric carbon atom. Hence, it is a reducing sugar.

Lactose and Ribose-5-phosphate are also reducing in nature due to the presence of a free ketonic or aldehyde group. 

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