Check your knowledge of enzyme by answering few simple questions. On an average a person should be able to score 80%.

1. What is a cofactor?
   1. Inorganic ions
   2. Organic molecules
   3. Both a and b
   4. None of the above
2. What is a coenzyme?
   1. Inorganic ions
   2. Organic molecules
   3. Organic molecules containing metals
   4. Both b and c
3. A coenzyme or metal ion that is very tightly or even covalently bound to the enzyme is called?
   1. Holoenzyme
   2. Prosthetic group
   3. Apoenzyme
   4. None of these
4. A complete catalytically active enzyme together with its bound enzyme or metal ions is called?
   1. Holoenzyme
   2. Prosthetic group
   3. Apoenzyme
   4. None of these
5. The protein part of holoenzyme is called?
   1. Apoprotein
   2. Apoenzyme
   3. Prosthetic group
   4. Both a and b
6. Which suffix is added to the name of the substrate or to a word or to a phrase describing the activity of enzyme, to name an enzyme?
   1. -Ise
   2. -Ase
   3. -Ic
   4. -Ace
7. In how many classes enzyme is divided by Enzyme Commission?
   1. 4
   2. 5
   3. 2
   4. 6
8. What is the EC number of ATP:glucose phosphotransferase?
   1. 1.1.1.1.
   2. 2.7.2.2.
   3. 2.7.1.2.
   4. 2.7.1.1
9. What does the first, second, third and fourth number in EC stands for?
   1. Class name, subclass, hydroxyl group acceptor, phosphoryl group acceptor
   2. Class name, subclass, phoshoryl group acceptor, acetyl group acceptor
   3. Class name, subclass, phoshoryl group acceptor, hydroxyl group acceptor
   4. Both a and c
10. What is the trivial name of ATP:glucose phosphotransferase?
    1. Glucose oxidase
    2. Hexokinase
    3. Transferase
    4. Nuclease
11. The site where enzyme catalyzed reaction takes place is called?
    1. Active site
    2. Catalytic site
    3. Activity site
    4. Functional site
12. The molecule that is bound and acted upon by the enzyme is called?
    1. Biomolecule
    2. Substancee
    3. Reactant
    4. Substrate
13. Who proposed the existence of enzyme-substrate complex in 1880?
    1. Charles Woods
    2. Adolph Hayden
    3. Charles Adolphe Wurtz
    4. Adolphe Woods
14. Action of catalyst affects:
    1. Rate of reaction
    2. Reaction equilibrium
    3. Both a and b
    4. None of these
15. The starting point for either the forward or reverse reaction is called?
    1. Active state
    2. Productive state
    3. Excited state
    4. Ground state
16. What are the standard sets of conditions?
    1. 298K, 1atm and 1M
    2. 300K, 101.3kPa and 1M
    3. 273K, 1 bar and 0.1M.
    4. 25°C, 101.3kPa and 1M
17. DG° is called?
    1. Biochemical free energy change
    2. Gibb’s free energy
    3. Standard free energy
    4. Standard free energy change
18. DG° is called?
    1. Biochemical free energy change
    2. Gibb’s free energy
    3. Biochemical free energy
    4. Standard free energy change
19. The top of energy hill, at which decay to the substrate or product is equally probable, is called?
    1. Excitation state
    2. Activation state
    3. Decay state
    4. Transition state
20. DG++ is called?
    1. Transition energy
    2. Activation energy
    3. Mutation energy
    4. Translation energy
21. The difference in the energy levels between the ground state and transition state is called?
    1. Transition energy
    2. Activation energy
    3. Mutation energy
    4. Translation energy
22. What will happen to reaction if activation energy is increased?
    1. Rate of reaction decrease
    2. Rate of reaction increase
    3. Reaction equilibrium shifts forward
    4. Reaction equilibrium shifts backward
23. What will happen to reaction if temperature is increased?
    1. Rate of reaction decrease
    2. Rate of reaction increase
    3. Reaction equilibrium shifts forward
    4. Reaction equilibrium shifts backward
24. What will happen to reaction if enzyme is added?
    1. Rate of reaction decrease
    2. Rate of reaction increase
    3. Reaction equilibrium shifts forward
    4. Reaction equilibrium shifts backward
25. Can an enzyme catalyze SàP and PàS conversion?
    1. Yes
    2. No
    3. Sometimes
    4. Mostly
26. The step which decides the rate of reaction is called?
    1. Acceleration step
    2. Reaction inhibiting step
    3. Rate limiting step
    4. Reaction enhancing step

27. What is the characteristic of rate limiting step?

1. Determines the reaction equilibrium
2. Inhibits reaction
3. Determines the rate of reaction
4. Both a and c

28. Is it possible to have several steps with equal activation energy?

1. Yes
2. No

29. What is the importance of energy barrier?

1. To increase the work for our cells
2. To prevent the conversion of complex molecules to small and simple molecules
3. To maintain cell structure and integrity
4. Both b and c

30. What should be the value of DG/0 for the reaction to occur?

1. Negative
2. Zero
3. Positive
4. Any value

Answers:

1. 1
2. 4
3. 2
4. 1
5. 4
6. 2
7. 4
8. 4
9. 1
10. 2
11. 1
12. 4
13. 3
14. 1
15. 4
16. 1
17. 4
18. 1
19. 4
20. 2
21. 2
22. 1
23. 2
24. 2
25. 1
26. 3
27. 3
28. 1
29. 4
30. 1

More enzyme quiz related articles, refer:

1) General Biochemistry

2) Quiz on Enzymes

3) Quiz on Enzymes 3

4) Quiz on Enzymes 4

5) Quiz on Enzyme Kinetics

6) Enzyme Quiz