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Question
Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
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Solution
Lactose is commonly known as milk sugar since this disaccharide is found in milk. It is composed of β-D-galactose and β-D-glucose. The linkage is between C1 of galactose and C4 of glucose.
Lactose
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\[\begin{array}{cc}
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| (I) |  |
| (II) |  |
| (III) |  |
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OR
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