1. What is the primary function of enzymes in living cells?

a) To synthesize large molecules b) To cleave large molecules

c) To catalyze specific chemical reactions d) To liberate energy
2. Who coined the term "enzyme" in 1878?
a) Friedrich Wilhelm Kuhn b) Thomas Cech c) Sidney Altman d) Emil Fischer
3. What is the term for enzymes that are made up of protein and non-protein parts?
a) Conjugated enzymes b) Simple enzymes c) Complex enzymes d) Holoenzymes
4. What is the active site of an enzyme?
a) The region where the enzyme binds to the substrate
b) The region where the enzyme catalyzes the reaction
c) The region where the enzyme is synthesized
d) The region where the enzyme is stored
5. What is the lock and key model of enzyme action?
a) A model that proposes enzymes have a flexible active site
b) A model that proposes enzymes have a rigid active site
c) A model that proposes enzymes have a dynamic active site
d) A model that proposes enzymes have a static active site
6. Who proposed the induced fit model of enzyme action?
a) Emil Fischer b) Koshland c) Thomas Cech d) Sidney Altman
7. What is the effect of temperature on enzyme activity?
a) Increases enzyme activity b) Decreases enzyme activity
c) Has no effect on enzyme activity d) Depends on the enzyme
8. What is the optimum temperature for human enzymes?
a) 25°C b) 37°C c) 42°C d) 100°C
9. What is the effect of pH on enzyme activity?
a) Increases enzyme activity b) Decreases enzyme activity
c) Has no effect on enzyme activity d) Depends on the enzyme
10. What is competitive inhibition?
a) Inhibition that occurs when a molecule binds to the active site
b) Inhibition that occurs when a molecule binds to an allosteric site
c) Inhibition that occurs when a molecule binds to the enzyme-substrate complex
d) Inhibition that occurs when a molecule binds to the enzyme
11. What is non-competitive inhibition?
a) Inhibition that occurs when a molecule binds to the active site
b) Inhibition that occurs when a molecule binds to an allosteric site
c) Inhibition that occurs when a molecule binds to the enzyme-substrate complex
d) Inhibition that occurs when a molecule binds to the enzyme
12. What is uncompetitive inhibition?
a) Inhibition that occurs when a molecule binds to the active site
b) Inhibition that occurs when a molecule binds to an allosteric site
c) Inhibition that occurs when a molecule binds to the enzyme-substrate complex
d) Inhibition that occurs when a molecule binds to the enzyme
13. What is feedback inhibition?
a) A type of competitive inhibition b) A type of non-competitive inhibition
c) A type of uncompetitive inhibition d) A type of enzyme activation
14. What is the term for the molecule that binds to the active site of an enzyme?
a) Substrate b) Inhibitor c) Activator d) Cofactor
15. What is the term for the process by which an enzyme is inactivated?
a) Denaturation b) Inhibition c) Activation d) Catalysis
16. What is the term for the substance that is converted into a product by an enzyme?
a) Substrate b) Inhibitor c) Activator d) Cofactor
17. What is the term for the substance that helps an enzyme to catalyze a reaction?
a) Cofactor b) Inhibitor c) Activator d) Substrate
18. What is the term for the process by which an enzyme is activated?
 a) Activation b) Inhibition c) Denaturation d) Catalysis
19. What is the term for the substance that binds to an enzyme and reduces its activity?
a) Inhibitor b) Activator c) Cofactor d) Substrate
20. What is the term for the process by which an enzyme catalyzes a reaction?
a) Catalysis b) Inhibition c) Activation d) Denaturation
21. What is the term for the substance that is produced by an enzyme-catalyzed reaction?
a) Product b) Substrate c) Inhibitor d) Cofactor
22. What is the term for the study of the rates of enzyme-catalyzed reactions?
a) Enzyme kinetics b) Enzyme thermodynamics c) Enzyme dynamics d) Enzyme statics
23. What is the term for the substance that binds to an enzyme and increases its activity?
a) Activator b) Inhibitor c) Cofactor d) Substrate
24. What is the term for the substance that is converted into a product by an enzyme-catalyzed reaction?
a) Substrate b) Product c) Inhibitor d) Cofactor
25. What is the term for the substance that binds to an enzyme and reduces its activity?
a) Inhibitor b) Activator c) Cofactor d) Substrate
26. What is the term for the process by which an enzyme catalyzes a reaction?
a) Catalysis b) Inhibition c) Activation d) Denaturation
27. What can accelerate enzyme activity?
a) Inhibitor b) Activator c) Substrate d) product
28. What is the nature of most enzymes?
a) Fibrous proteins b) Globular proteins c) Lipids d) Carbohydrates
29. What is the role of the binding site on an enzyme?
a) To catalyze the reaction b) To make temporary bonds with the substrate
c) To inhibit the reaction d) To store energy
30. What is the role of the catalytic site on an enzyme?
a) To bind the substrate b) To catalyze the reaction
c) To inhibit the reaction d) To store energy
31. What are enzymes sensitive to?
a) Temperature and pH b) Light and sound
c) Pressure and humidity d) Magnetic fields
32. What forms the active site of an enzyme?
a) Lipids b) Carbohydrates c) Amino acids d) Nucleotides
33. What are inorganic co-factors that can be metallic ions called?
a) Coenzymes b) Prosthetic groups c) Activators d) Substrates
34. What is an enzyme without its co-factor called?
a) Holoenzyme b) Apoenzyme c) Coenzyme d) Substrate
35. What is the complete, active enzyme with its co-factor called?
a) Holoenzyme b) Apoenzyme c) Coenzyme d) Substrate
36. What forms when a substrate binds to the active site of an enzyme?
a) Enzyme-product complex b) Enzyme-substrate complex
c) Holoenzyme d) Apoenzyme
37. What does the induced fit model suggest about the active site?
a) It is rigid b) It is flexible c) It is permanently fixed d) It is non-functional
38. What happens to enzymes at 100°C?
a) They become highly active b) They are completely denatured
c) They are partially active d) They are not affected
39. What is the temperature at which enzyme activity is maximum called?
a) Minimum temperature b) Maximum temperature
c) Optimum temperature d) Denaturation temperature
40. What is the optimum pH for the enzyme amylase released from the pancreas?
a) 1.4 b) 4.5 c) 7.0 d) 8.5