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प्रश्न
The linkage present in Lactose is ______.
विकल्प
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.
Give scientific reasons:
Hydrolysis of sucrose is called inversion.
Glucose on oxidation with dilute nitric acid gives _______________
Write the name of the polysaccharide used for the commercial preparation of glucose.
Draw the structure of α-D glucopyranose.
Classify the following carbohydrates into monosaccharide, disaccharide, oligosaccharide and polysaccharide:
glucose, cellulose, maltose, stachyose
Explain the classification of carbohydrates with examples.
Draw the Haworth projection structure of the following.
α-D-(–)-Fructofuranose
What is monosaccharide?
Draw the structure of the pyran.
Which enzymes would work sequentially on potatoes consumed by an individual?
Which of the following carbohydrate is sweet to taste?
From the following which is a heteropolysaccharide?
From the following identify the materials that are made up of cellulose.
i. Plant cell wall
ii. Exoskeleton of arthropods
iii. Paper from plant pulp
iv. Cotton fibre
Which is the product obtained, when Br2 water reacts with glucose?
Match the Column I and Column II select the correct option.
| Column I | Column II | ||
| i. | Monosaccharides | a. | Stored energy in animals |
| ii. | Glycogen | b. | Polymer made from ß-glucose molecules |
| iii. | Cellulose | c. | Exoskeleton of arthropods |
| iv. | Chitin | d. | Building blocks of carbohydrates |
| e. | Plant hormone |
Chitin is a/an ______.
____________ do not give smaller sugar units on hydrolysis.
From the following identify the two types of glucose polymers present in starch.
Raffinose, sucrose and stachyose are respectively ____________.
Which element among the following is not present in saccharine?
The general formula for polysaccharide is ____________.
Which one of the following is Tetrose sugar?
Which of the following statements is NOT true for glyceraldehyde?
Which following reagent is used to detect presence of five hydroxyl groups in a glucose molecule?
Identify the number of secondary carbon atoms in glucose.
When 2 moles of stachyose is hydrolyzed, the number of moles of galactose obtained is ____________.
On hydrolysis sucrose gives ____________.
Which among the following sugars does not reduce Tollen's reagent?
Identify the number of oxygen atoms present in saccharic acid?
Which one of the following rotates the plane polarized light towards left?
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.
α-D (+) Glucose and β-D (+) glucose are ____________.
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Maltose
Write the structure of α-D (+) glucopyranose.
Is the following sugar, D-sugar or L-sugar?
If 'n' represents total number of asymmetric carbon atoms in a compound, then the possible· number of optical isomers of the compound is ______.
Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?
Match the Column I with Column II and choose the correct answer from options below:
| Column I | Column II |
| A. Purine | 1. Glycogen |
| B. Pyrimidine | 2. Cellulose |
| C. Structural polysaccharide | 3. Glucagon |
| D. Storage polysaccharide | 4. Adenine |
| 5. Cytosine |
Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.
Formation of gluconic acid from glucose by oxidation using Br2 water.
The glycosidic linkage present in maltose is ______.
Assign D/L configuration to the following monosaccharides:
Carbohydrates that do not undergo hydrolysis further are called ______.
Write Fischer projection formulae for glucose.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why carbohydrates are generally optically active.
Why are carbohydrates generally optically active?
Why carbohydrates are generally optically active?
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
\[\ce{CH2OH - CO - (CHOH)4 - CH2OH}\] is an example of ______.
Why carbohydrates are generally optically active.
The sugar found in milk is ______.
