2. Enzymes work by:
Anonymous Quiz
51%
A) Increasing activation energy
22%
B) Decreasing activation energy
22%
C) Changing the equilibrium constant
5%
D) Consuming reactants
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3. The enzyme urease catalyzes the breakdown of:
Anonymous Quiz
16%
A) Proteins
71%
B) Urea
8%
C) Lipids
5%
D) Nucleotides
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4. The IUB classification of enzymes is based on:
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17%
A) The substrate they act upon
64%
B) The type of reaction they catalyze
12%
C) Their molecular weight
7%
D) The organ in which they function
5. The enzyme that catalyzes oxidation-reduction reactions belongs to which class?
Anonymous Quiz
9%
A) Transferases
17%
B) Hydrolases
72%
C) Oxidoreductases
2%
D) Ligases
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6. The Michaelis-Menten equation describes:
Anonymous Quiz
20%
A) Enzyme inhibition
64%
B) Enzyme kinetics
14%
C) Enzyme degradation
3%
D) Protein folding
7. In a Lineweaver-Burk plot, the x-intercept represents:
Anonymous Quiz
35%
A) 1/Vmax
30%
B) -1/Km
30%
C) Vmax
5%
D) 1/[S]
8. A competitive inhibitor:
Anonymous Quiz
56%
A) Binds to the active site
27%
B) Binds to an allosteric site
12%
C) Increases enzyme activity
5%
D) Is irreversible
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9. Non-competitive inhibition:
Anonymous Quiz
22%
A) Increases Vmax
39%
B) Lowers Vmax
15%
C) Increases Km
24%
D) Competes with the substrate
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10. Allosteric enzymes:
Anonymous Quiz
45%
A) Follow Michaelis-Menten kinetics
21%
B) Are regulated by effectors
23%
C) Function only at low temperatures
11%
D) Require ATP for activation
11. Which enzyme is used in the treatment of myocardial infarction?
Anonymous Quiz
12%
A) Amylase
72%
B) Streptokinase
6%
C) Urease
10%
D) Trypsin
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12. Enzyme repression is a form of:
Anonymous Quiz
20%
A) Positive regulation
40%
B) Negative regulation
30%
C) Competitive inhibition
10%
D) Irreversible inhibition
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13. Which coenzyme is involved in redox reactions?
Anonymous Quiz
36%
A) Coenzyme A
40%
B) NAD+
8%
C) Biotin
16%
D) Thiamine pyrophosphate
14. Which vitamin is the precursor of coenzyme A?
Anonymous Quiz
9%
A) Vitamin C
29%
B) Vitamin B12
47%
C) Pantothenic acid
15%
D) Folic acid
15. The enzyme hexokinase catalyzes the conversion of:
Anonymous Quiz
70%
A) Glucose to glucose-6-phosphate
16%
B) Fructose to glucose
7%
C) Glycogen to glucose
7%
D) ATP to ADP
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16. Which of the following enzymes is a marker for liver damage?
Anonymous Quiz
8%
A) Amylase
62%
B) Alanine transaminase (ALT)
24%
C) Creatine kinase
6%
D) Pepsin
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18. Which enzyme catalyzes the reversible reaction between carbon dioxide and water to form carbonic acid?
Anonymous Quiz
80%
A) Carbonic anhydrase
11%
B) Urease
7%
C) Lipase
2%
D) Trypsin
19. The enzyme responsible for detoxifying hydrogen peroxide in cells is:
Anonymous Quiz
7%
A) Catalase
65%
B) Peroxidase
25%
C) Superoxide dismutase
3%
D) Amylase
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20. The enzyme involved in blood clotting is:
Anonymous Quiz
4%
A) Pepsin
8%
B) Trypsin
87%
C) Thrombin
1%
D) Amylase
21. Which enzyme deficiency leads to lactose intolerance?
Anonymous Quiz
6%
A) Sucrase
76%
B) Lactase
14%
C) Amylase
4%
D) Maltase
22. The enzyme lipase catalyzes the hydrolysis of:
Anonymous Quiz
10%
A) Proteins
71%
B) Lipids
16%
C) Carbohydrates
3%
D) Nucleotides
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