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(A) Enzymes are needed in large quantiti...

(A) Enzymes are needed in large quantities for the progress of a reaction.
(R) Enzymes increases the magnitude of activation energy.

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

Verified by Experts

The correct Answer is:
D
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(A) Rate of the hydrolysis of sucrose in the presence of acid is less when compared with the presence of sucrase enzyme. (R) Enzyme sucrase reduces the magintude of activation energy for hydrolysis of sucrose.

Enzymes enhance the rate of reaction by

Enzymes are divided into how many classes based on the type of reaction they catalyse

(A)Catalyst increases the rate of reaction. (R ) Catalyst functions by lowering the energy of activation.

(A) The addition of catalyst lowers the activation barrier, yet there is no change in the enthalpy of reaction. (R ) Enthalpy change is equal to the difference in the activation energy for the forward and the backward reactions.

How is the reaction rate influenced by energy of activation ?

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AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) Vitamin 'C' is ascorbic acid. (R) All acids are vitamins

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  2. (A) All hormone receptors are proteins, (R) All hormones are protein...

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  3. (A) Water soluble vitamins like ascorbic acid must be supplied regular...

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  4. (A) Vitamins are important in diet. (R) Deficiency of vitamins cause...

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  5. (A) Insulin is a steroidal harmone. (R) A steroid contains two five ...

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  6. (A) Vitamins are considered as essential food factors. (R) Most of th...

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  7. (A) Vitamins are to be supplimented to the body as an energy source. ...

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  8. (A) Deficiency of vitamin K causes excessive bleeding in injuries. (...

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  9. (A) Enzyme catalysed hydrolysis of sucrose is faster than acid catalys...

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  10. (A) Insulin is a globular protein. (R) Insulin has two polypeptide c...

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  11. (A) Low level of thyroxine leads to hypo- thyroidism. (R) Thyroxine ...

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  12. (A) Carbohydrate metabolism is controlled by gluco corticoids. (R) H...

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  13. (A) Enzymes are needed in large quantities for the progress of a react...

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  14. (A) Hormones are produced by endocrine glands in the body. (R) Hormo...

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  15. (A) The deficiency of vitamins causes specific diseases. (R) All vit...

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  16. (A) Taking excess vitamin pills are harmless. (R) All the vitamins a...

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  17. (A) Vitamins A, D, E and K are stored in liver and adipose tissues. ...

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  18. (A) 'B' group vitamins except B-12 cannot be stored in our body. (R)...

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  19. (A) Epinephrine and nm epinephrine are derivatives of polypeptides. ...

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  20. (A) B-complex vitamins and vitamin-C are not stored in the body. (R)...

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