Enzymes – Online MCQs Test – Biology 9th

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

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

3. All enzymes work at their maximum rate at:

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

5. The protein nature of the enzymes makes them sensitive to:

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

7. All are factors affecting enzymes activity except:

8. In 1958, the induced fit model suggested by:

9. Reactions of an organism are collectively called:

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

11. In 1894, the lock and key model theory was first postulated by:

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

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

14. The protein nature of the enzymes makes them extremely sensitive to:

15. All are characters of enzymes except:

16. The metabolic activities are always of:

17. Most enzymes work at neutral pH:

18. Enzyme are:

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

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