Concept:Lactose is a disaccharide connected by a glycosidic bond between its two monosaccharide units.
Identify the carbons involved in that bond to determine the linkage type.
Explanation:Lactose is made of
β-D-galactose and D-glucose.
The glycosidic bond forms between carbon 1 of
β-D-galactose and carbon 4 of D-glucose.
Because the galactose unit is in the
β configuration, the linkage is named
β−1,4.
Therefore, the correct glycosidic linkage in lactose is
β−1,4.
Answer:Option B:
β−1,4