Enzymes Mdcat Mcqs
1. Enzymes are:
A. Carbohydrates
B. Lipids
C. Proteins
D. Vitamins
Answer: C. Proteins
2. The region of enzyme where substrate binds is called:
A. Active site
B. Binding site
C. Reaction site
D. Catalytic center
Answer: A. Active site
3. Enzymes speed up reactions by:
A. Increasing activation energy
B. Decreasing activation energy
C. Increasing temperature
D. Changing equilibrium
Answer: B. Decreasing activation energy
4. Which model explains enzyme action?
A. Fluid mosaic model
B. Lock and key model
C. Bohr model
D. Sandwich model
Answer: B. Lock and key model
5. Enzymes are specific due to:
A. Shape of active site
B. Temperature
C. pH
D. Concentration
Answer: A. Shape of active site
6. A non-protein part of enzyme is called:
A. Apoenzyme
B. Cofactor
C. Substrate
D. Product
Answer: B. Cofactor
7. Enzyme + Cofactor =
A. Apoenzyme
B. Holoenzyme
C. Substrate
D. Product
Answer: B. Holoenzyme
8. Optimum temperature for most human enzymes is:
A. 25°C
B. 37°C
C. 50°C
D. 100°C
Answer: B. 37°C
9. Denaturation of enzyme occurs at:
A. Low temperature
B. High temperature
C. Neutral pH
D. Low substrate
Answer: B. High temperature
10. Competitive inhibitors:
A. Bind to allosteric site
B. Compete with substrate
C. Destroy enzyme
D. Increase enzyme activity
Answer: B. Compete with substrate
11. Enzyme activity is highest at:
A. Very low pH
B. Very high pH
C. Optimum pH
D. Any pH
Answer: C. Optimum pH
12. Which factor does NOT affect enzyme activity?
A. Temperature
B. pH
C. Light
D. Substrate concentration
Answer: C. Light
13. Enzymes are reusable because:
A. They are not consumed
B. They are destroyed
C. They change permanently
D. They evaporate
Answer: A. They are not consumed
14. Induced fit model suggests:
A. Active site is rigid
B. Active site changes shape
C. No binding occurs
D. Enzyme breaks
Answer: B. Active site changes shape
15. Example of enzyme is:
A. Amylase
B. Glucose
C. DNA
D. Oxygen
Answer: A. Amylase
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