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Lactose is disaccharide of
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$\beta-D$-glucose and $\beta$-D -galactose
Lactose is a disaccharide of $\beta-\mathrm{D}(+)$-glucose and $\beta-D(+)$-galactose. These monosaccharides are joined together with $\beta-1,4$-glycosidic linkage. It is a reducing sugar.
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