Enzymes mcqs test 3 || enzymes inhibition and classification of enzymes

Enzyme Inhibition & Classification – MCQs

1. Decrease in enzyme activity is called:

Enzyme activation Enzyme inhibition Denaturation Catalysis

2. Substances that decrease enzyme activity are called:

Inhibitors Activators Substrates Coenzymes

3. How many main types of enzyme inhibition are there?

Two Three Four Five

4. Competitive inhibitors bind to:

Active site Allosteric site Coenzyme Product site

5. Competitive inhibitors are similar to:

Substrate Product Activator Co-factor

6. Penicillin is an example of:

Competitive inhibitor Non-competitive inhibitor Uncompetitive inhibitor Activator

7. Competitive inhibition can be overcome by:

Increasing substrate concentration Increasing inhibitor Removing enzyme Changing temperature

8. Non-competitive inhibitors bind at:

Active site Allosteric site Substrate site Product site

9. Allosteric site means:

Away from active site Same as active site Near substrate Inside product

10. Feedback inhibition is an example of:

Non-competitive inhibition Competitive inhibition Uncompetitive inhibition Irreversible inhibition

11. Uncompetitive inhibitors bind to:

Free enzyme Enzyme-substrate complex Active site Product

12. Feedback inhibition occurs when:

Product concentration is high Substrate is absent Temperature is high pH is low

13. Which enzyme class performs oxidation-reduction?

Oxidoreductase Hydrolase Transferase Ligase

14. Transferase enzymes transfer:

Functional groups Hydrogen Water Electrons only

15. Hydrolase enzymes break bonds using:

Water ATP Oxygen Hydrogen

16. Lyase enzymes break bonds without:

Hydrolysis Energy Substrate Enzyme

17. Isomerase enzymes cause:

Intramolecular rearrangement Hydrolysis Oxidation Reduction

18. Ligase enzymes are also called:

Synthetase Hydrolase Lyase Isomerase

19. Protease enzymes act on:

Proteins Lipids Carbohydrates Nucleic acids

20. Lipase breaks down:

Fats Proteins Starch DNA

21. Amylase acts on:

Amylose Cellulose Lactose Sucrose

22. Maltase converts maltose into:

Glucose Fructose Sucrose Cellulose

23. Lactase acts on:

Lactose Maltose Sucrose Starch

24. Enzyme inhibitors are important in:

Drug discovery Photosynthesis only Digestion only Respiration only

25. RNAase acts on:

RNA DNA Protein Lipids