Q 1 :    

The incorrect statements regarding enzymes are:

 

(A) Enzymes are biocatalysts.

(B) Enzymes are non-specific and can catalyse different kinds of reactions.

(C) Most enzymes are globular proteins.

(D) Enzyme oxidase catalyses the hydrolysis of maltose into glucose.

 

Choose the correct answer from the options given below:                          [2024]

  • (A), (B) and (C)

     

  • (B) and (D)

     

  • (B), (C) and (D)

     

  • (B) and (C)

     

(B)

Enzymes are specific in their catalytic action. Particular enzyme catalyze specific reactions.

The enzyme maltase converts maltose to glucose.

C12H22O11(aq)+H2O(l)Maltase2C6H12O6(aq)

  (Maltose)                                                      (glucose)

 



Q 2 :    

From the vitamins A, B1B6B12, C, D, E, and K, the number of vitamins that can be stored in our body is ______.           [2024]



(5)

(i) Fat soluble vitamins: Vitamins which are soluble in fat and oils but insoluble in water are kept in this group. These are vitamins A, D, E, and K. They are stored in liver and adipose (fat storing) tissues.

(ii) Water soluble vitamins: B group vitamins and vitamin C are soluble in water so they are grouped together. Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B12) in our body.