The linkage between the two monosaccharide units in lactose is
(a) C₁ of β-D-glucose and C₄ of β-D-galactose
(b) C₁ of β-D-galactose and C₄ of β-D-glucose
(c) C₁ of α-D-galactose and C₄ of β-D-glucose
(d) C₁ of β-D-galactose and C₄ of α-D-glucose
Answers
The linkage between the two monosaccharide units in lactose is (b) C₁ of β-D-galactose and C₄ of β-D-glucose.
The linkage between the two monosaccharide units in lactose is
- (a) C₁ of β-D-glucose and C₄ of β-D-galactose
- (b) C₁ of β-D-galactose and C₄ of β-D-glucose
- (c) C₁ of α-D-galactose and C₄ of β-D-glucose
- (d) C₁ of β-D-galactose and C₄ of α-D-glucose
important points :
- Carbohydrates is a group of compound containing in the living tissues and food in the form of sugars, starch and cellulose.
- Basically carbon, hydrogen and oxygen atoms are components of a general carbohydrate. general formula of it is Cₓ(H₂O)ₙ , where x and n are integers.
- Basically, there are three types of carbohydrates ; monosaccharide, disaccharide and polysaccharide are
- monosaccharide contains either aldehyde groups or ketone or many -OH groups.
- lactose is known as milk sugar because it occurs in the milk of humans , cows and different Mammalia kingdom. this is the lowest ranking sugar in term of sweetness. It is just one sixth as sweet as sucrose.
Linkage of two monosaccharide units in lactose : Lactose is reducing sugar composed of one molecule of D galactose and one molecule of D-glucose joined by a β-1,4-glycosidic bond. See the diagram shown in the answer. It is clear that the linkage between two monosaccharide units in lactose is C₁ of β-D-galactose and C₄ of β-D-glucose.
Therefore the correct option is (b).
Also read similar questions : The enantiomer of D-glucose is:
(A) D-galactose
(B) L-galactose
(C) both of them
(D) none of them
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The glycosidic linkage involved in linking the glucose units
in amylose part of starch is
(a) C₁ – C₄ β linkage (b) C₁ –...
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