Answer to Question #76472 in Zoology for Noor
In monosaccharides, the hemiacetal group is free, and thus, all of them are reducing.
In disaccharides, hemiacetal group can participate in formation of glycoside bond. It is typical for sucrose, which is thus, a non-reducing sugar.
However, in some disaccharides, the hemiacetal group is not used for the formation of glycoside bond, and thus, they appear reducing. The examples of such sugars are lactose and maltose.
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