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प्रश्न
The linkage present in Lactose is ______.
पर्याय
α, β - 1, 2 - glycosidic linkage
α - 1, 4 - glycosidic linkage
β - 1, 4 - glycosidic linkage
α - 1, 4 - glycosidic linkage
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उत्तर
The linkage present in Lactose is β - 1, 4 - glycosidic linkage.
Explanation:
Lactose is a disaccharide composed of glucose and galactose.
These two monosaccharides are joined by a β-1,4-glycosidic bond, where the hydroxyl group on carbon 1 of galactose (in the β-configuration) is linked to the hydroxyl group on carbon 4 of glucose.
This type of linkage is hydrolysed by the enzyme lactase in the human body during digestion.
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संबंधित प्रश्न
Give scientific reasons:
The disaccharide sucrose gives negative Tollens test while the disaccharide maltose gives a positive Tollens test.
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Write the name of the polysaccharide used for the commercial preparation of glucose.
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Write chemical reaction for following conversions
glucose into glucoxime
What is the action of the following reagents on glucose?
acetic anhydride
Draw the structure of the pyran.
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Formation of lactose by conden ation results in the release of how many molecules of water?
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i. Plant cell wall
ii. Exoskeleton of arthropods
iii. Paper from plant pulp
iv. Cotton fibre
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____________ do not give smaller sugar units on hydrolysis.
Monosaccharides are ______ in nature.
Identify the CORRECT combination.
Which carbon atoms of α- D glucopyranose and β-D-fructofuranose respectively are linked together to form glycosidic linkage in sucrose?
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Which one of the following is Tetrose sugar?
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What is the number of hydroxyl groups present in lactic acid?
When 2 moles of stachyose is hydrolyzed, the number of moles of galactose obtained is ____________.
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On hydrolysis sucrose gives ____________.
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Which among the following reagents is used to obtain gluconic acid from glucose?
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\[\ce{Maltose ->[Hydrolysis] X ->[dil. HNO3][(excess)] Y}\]
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How many optical isomers are possible for a compound having four asymmetric carbon atoms?
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives equal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
The number of sp2 and sp3 hybridised carbon in fructose are respectively ____________.
What are reducing and non-reducing sugars?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Starch
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Maltose
Corn is immersed in boiling water. It is then cooled, and the solution becomes sweet. It is due to ______.
Which one is a non-reducing commercial sugar?
Formation of gluconic acid from glucose by oxidation using Br2 water.
Describe the action of the following reagent on glucose:
Bromine water
Write the ring structure of glucose.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why are carbohydrates generally optically active?
Why carbohydrates are generally optically active?
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Why carbohydrates are generally optically active?
Why carbohydrates are generally optically active.
The sugar found in milk is ______.
