Enzymes – Online MCQs Test – Biology 9th

1. The phenomenon of chemical activity in an organism is called:

2. Enzymes are biocatalyst, made up of mostly:

3. Choose the correct statement regarding look and key model.

4. Enzyme are:

5. Rate of reaction will increase when temperature:

6. Active site continuously changes it shapes until the substrate do not bind to it, is statement of:

7. Metabolic reactions are:
(i) Constructive reactions
(ii) Destructive reactions
(iii) inhibiting reactions

8. Activity of enzymes can be enhanced by:

9. The biocatalysts which facilitate chemical reaction by lowering activation energy is called:

10. Select the mismatched:

11. Reactions of an organism are collectively called:

12. All are characters of enzymes except:

13. Chemical reaction requires particular conditions to carry down at proper rate, especially:

14. Enzymes are sensitive to a minor change in:

15. In constructive reactions, large molecules are formed to form a structure of cell or body. These reaction are called:

16. Reactants of enzyme are called:

17. By inhibitor, the activity of enzymes can be:

18. The minimum amount of energy, a reaction requires to initiate, is called:

19. Enzymes have specific shape with three dimensionally folded chains of:

20. The point where the enzyme is most active is known as:

21. A small portion of enzyme where substrate attaches with enzyme is called:

22. The metabolic activities are always of:

23. All are factors affecting enzymes activity except:

24. In destructive reactions large molecules breakdown in small molecules to produce energy is called:

25. Its action allows biological reaction to proceed rapidly at relatively low temperature and pressure tolerable by living organism.