(A) Lactose is a disaccharide composed of $\beta-D-galactose$ and $\beta-D-glucose$ units.These units are linked by a $\beta-1,4-glycosidic$ linkage.T

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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 $\beta-1,4-glycosidic$ linkage.The structure of lactose is correctly represented by the image $250769-$s,which shows the $\beta-1,4$ linkage between the $C-1$ of galactose and $C-4$ of glucose.