Top MCQ,s of ENZYMES-11-Class-Biology-Chapter-3.

Enzymes are active biological molecules used to speed up metabolic chemical reaction without consuming in reaction....

ENZYMES MULTIPLE CHOICE QUESTION.

1.The normal PH value for pepsin to work is:

A):5

B):2

C):3.6.

D);4.5.

2.Enzymes are formed from:

A):Glucose.

B):Fatty acid.

C):Glycerol.

D);Amino acid.

3:The enzymes without its cofactors is called:

A):Holoenzymes.

B):Functional enzymes.

C):Apoenzymes.

D);None of them.

4:All of the following act as coenzymes except:

A):NAD.

B):FAD.

C):ATP.

D);None of them .

5.The enzyme attach to their co factor is called:

A):Apoenzymes.

B):Holoenzymes.

C):Inactive enzymes.

D);All of them.

6.Which of the following factor does not affect the rate of enzyme action.

A):Light intensity.

B):Enzyme concentration.

C):Temperature.

D);Substrate concentration.

7.What will happen to a reaction if activation energy increase.

A):Rate of reaction decrease.

B):Rate of reaction decrease.

C):No effect on rate of reaction.

D);Reaction is reversed.

8.For most enzyme the optimum PH is about in range of:

A):5-6.

B):4-5.

C):7-8.

D);3-5.

9.Which of the following is produced with the combination of Apoenzymes and cofactors:

A):Holoenzymes.

B):Prosthetic Group.

C):Enzyme product complex.

D);None of above.

10. Diastase takes part in digestion  of:

A):Starch.

B):Protein.

C):Fats.

D);All of them.

                         ANSWER-KEY:

                                             1-B.-2-D.-3-C.-4-C.-5-B-

                                             6-A.-7-A.-8-C-9-A.-10-A.