(A) Lactose is a disaccharide composed of $\beta-D-galactose$ and $\beta-D-glucose$ units.These units are linked by a $\beta-C_{1}-C_{4}$ glycosidic l

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(A) Lactose is a disaccharide composed of $\beta-D-galactose$ and $\beta-D-glucose$ units.These units are linked by a $\beta-C_{1}-C_{4}$ glycosidic linkage.In contrast,Maltose and Amylose contain $\alpha-C_{1}-C_{4}$ glycosidic linkages.Sucrose contains an $\alpha-C_{1}-\beta-C_{2}$ glycosidic linkage between glucose and fructose.