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(A) Lactose is a reducing Sugar (R) La...

(A) Lactose is a reducing Sugar
(R) Lactose if formed by glucosidic link between `C_1` of (D) - galactose and `C_4` of b- (D) - glucose

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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(A) Lactose is a reducing sugar. (R) Lactose contains glucose and galactose units.

Incorrect statements among the following (A) Sucrose is reducing sugar (B) Two alpha- D- glucose units in maltose are linked by 1,4-linkage (C ) beta - D glucose and beta- D fructose units are linked by 1, 4-linkage in lactose (D) All polysaccharides are reducing nonsugars

(A) Sucrose is not a reducing sugar. (R) In sucrose, glucose is in pyranose form and fructose is in furanose form.

Regarding lactose some statements are given below (A) On hydrolysis lactose gives beta- D- galactose and beta-D -glucose In lactose C_(1) " of " beta - D- galactose has acetal structure and C_(1) " of " beta - D -glucose has hemiacetal structure (C ) In lactose molecule beta- D -galactose is a nonreducing unit and beta-D- glucose is a reducing unit The correct statements are

Which of the following statements is/are not true regarding glycogen ? A) It is non reducing sugar B) It has alpha -1,4- glycosidic linkages only C) It is an animal starch D) The monomer units are glucose and mannose

Correct statements regarding sucrose A) It is a reducing sugar B) It is a disaccharide with C_1-C_2 glycosidic linkage C) It posseses two types of rings D) It is dextro rotatory

How many of the following are correctly matched (I) Sucrose- (C_(1) - alpha) of glucose to (C_(2) - beta) of fructose (II) Lactose (C_(1) - beta) of galactose to C_(4) of glucose (III) Maltose - (C_(1) - beta) of glucose to C_(4) of another glucose (IV) Starch - (C_(1) - alpha) of glucose to C_(4) of adjacent glucose and of a glucose to (C_(1) - alpha) of adiacent glucose in one C_(6) of its structural components (V) Cellulose- (C_(1) - beta) of glucose to C_(4) of adjacent glucose

Observe the following statements (i) Sucrose has glycosidic linkage (ii) Cellulose is present in both plants and animals (iii) Lactose contains D-galactose and D-glucose units The correct statements are .

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) C6 H(10) O5 is a carbohydrates. (R) Most of the carbohydrates ha...

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  2. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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  3. (A) Lactose is a reducing Sugar (R) Lactose if formed by glucosidic ...

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  4. (A) D-Glucose and D-Mannose form identical osazone on reaction with ex...

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  5. (A) Sucrose is reducing sugar where as maltose is non-reducing sugar. ...

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  6. (A) Glucose gives a reddish-brown ppt with Fehling's solution. (R) R...

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  7. (A) Sucrose is a non-reducing carbohydrate. (R) In sucrose both the ...

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  8. (A) Glycogen is known as animal starch. (R) The structure of glycoge...

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  9. (A) Acetic acid fit into Cx(H2O)y gneral formula of carbohydrates. ...

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  10. (A) Honey has been used for a long time as an instant source of energy...

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  11. (A) Starch gives blue colour with iodine. (R) Starch form complex wi...

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  12. (A) DNA stores all the hereditary information of a biological species....

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  13. (A) 2-deoxyribose is reducing sugar. (R) 2-deoxyribose is constituen...

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  14. (A) Guanine unites with Cytosine but not with Thymine. (R) Guanine a...

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  15. (A) Adenine pairs up with thymine but not with cytosine. (R) With cy...

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  16. (A) The pyrimidine base thymine is present in RNA. (R) DNA controls ...

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  17. (A) In double helical structure of DNA, cytosine pairs with guanine wi...

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  18. (A) Uracil occur in RNA. (R) RNA controls the synthesis of proteins.

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  19. (A) DNA finger printing is used in forensic labs. (R) Every individu...

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  20. (A) DNA is the chemical basis of heredity and may be regarded as the r...

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