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The linkage between the two monosacchari...

The linkage between the two monosaccharide units in lactose is _____.

A

`C_1` of `beta`-D - glucose and C4 of `beta-`D - galactose

B

`C_1` of `beta-`D - galactose and C4 of `beta-`D - glucose

C

`C_1` of `beta - D -` galactose and `C_4 ` of `beta - D - ` glucose

D

`C_1` of `alpha-D-` glucose and `C_4` of `alpha-D-` glucose

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The correct Answer is:
B
Lactose is obtained by the condensation of one molecule of `beta` - D - glactopyranose `(C_1 -beta)` unit and one molecule of`beta` - D - glucopyranose `(C_4 - beta)` unit.
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Lactose is a

The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage. In disaccharides, if the reducing groups of monosaccharides i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars, e.g., sucrose. On the other hand, sugars in which these functional groups are free, are called reducing sugars, for example, maltose and lactose. A non reducing disaccharide 'A on hydrolysis with dilute acid gives an equimolar mixture of D-(+)glucose and D-(+)-Fructose. Name the linkage that holds the two units in the disaccharide?

The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage. In disaccharides, if the reducing groups of monosaccharides i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars, e.g., sucrose. On the other hand, sugars in which these functional groups are free, are called reducing sugars, for example, maltose and lactose. A non reducing disaccharide 'A on hydrolysis with dilute acid gives an equimolar mixture of D-(+)glucose and D-(+)-Fructose. In the above reaction, reactant 'A' is:

The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage. In disaccharides, if the reducing groups of monosaccharides i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars, e.g., sucrose. On the other hand, sugars in which these functional groups are free, are called reducing sugars, for example, maltose and lactose. A non reducing disaccharide 'A on hydrolysis with dilute acid gives an equimolar mixture of D-(+)glucose and D-(+)-Fructose. Glucose on reaction with acetic acid gives glucose pentaacetate. What does it suggest about the structure of glucose ?

The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage. In disaccharides, if the reducing groups of monosaccharides i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars, e.g., sucrose. On the other hand, sugars in which these functional groups are free, are called reducing sugars, for example, maltose and lactose. A non reducing disaccharide 'A on hydrolysis with dilute acid gives an equimolar mixture of D-(+)glucose and D-(+)-Fructose. What is the mixture of D-(+) glucose and D-(+) fructose known as ?

the number of monosaccharide units in a polysaccharide is

ERRORLESS-BIOMOLECULES -ASSERTION & REASON
  1. The linkage between the two monosaccharide units in lactose is .

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  2. Assertion : Glycine is amphoteric in nature . Reason: Glycine contai...

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  3. Assertion : sucrose is known as invert sugar Reason : sucrose is a di...

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  4. Assertion: Proteins on hydrolysis produce amino acids. Reason : Amin...

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  5. Assertion : Sucrose undergo mutarotation. Reason : Sucrose is a disa...

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  6. Assertion : DNA molecules and RNA molecules are found in the nucleus o...

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  7. Assertion: All amino acids exists as Zwitter ions. Reason: Amino aci...

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  8. Assertion(A): Activity of an enzyme is pH dependent. Reason(R): Chan...

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  9. Assertion : Glycosides are hydrolysed in acidic conditions. Reason ...

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  10. Assertion : Haemoglobin is an oxygen carrier. Reason : Oxygen binds...

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  11. Assertion. Carboxypetidase is an exopeptidase. Reason. It cleaves th...

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  12. Assertion : Sucrose is a non- reducing sugar. Reason : It has glycos...

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  13. Assertion : Sequence of bases in DNA is TGAACCCTT and sequence of base...

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  14. Assertion: Solubilities of proteins is minimum at the isoelectronic po...

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  15. Assertion : Amino acids are soluble in benzene and ether. Reason : A...

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  16. Assertion : Treatment of D-glucose with alkali affords an equilibrium ...

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  17. Assertion: Disruption of the natural structural of a protein is called...

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