Enzymes – Online MCQs Test – Biology 9th

1. All are characters of enzymes except:

2. Reactions of an organism are collectively called:

3. Enzymes are biocatalyst, made up of mostly:

4. Enzyme are:

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

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

7. Enzymes are sensitive to a minor change in:

8. Rate of reaction will increase when temperature:

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

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

11. Activity of enzymes can be enhanced by:

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

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

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

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

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

17. The metabolic activities are always of:

18. Reactants of enzyme are called:

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

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

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

22. All are factors affecting enzymes activity except:

23. Select the mismatched:

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

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