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- Question
When substrate [S] = KM (Michaelis-Menten constant), the velocity of an enzyme catalyzed reaction is about
Options- A. 0.1 * Vmax
- B. 0.2 * Vmax
- C. 0.5 * Vmax
- D. 0.9 * Vmax
- Correct Answer
- 0.5 * Vmax
- 1. Predominantly uncompetitive inhibition may be called when
Options- A. competitive inhibition is greater than uncompetitive inhibition
- B. competitive inhibition is smaller than uncompetitive inhibition
- C. competitive inhibition is equal to uncompetitive inhibition
- D. none of the above Discuss
- 2. Which category of enzymes belongs to class 5 in the international classification?
Options- A. Hydrolases
- B. Isomerases
- C. Oxido-reductases
- D. Cyclase Discuss
- 3. The ratio of the amount of a protein present in a sample, which is used as a measure of purification, is known as
Options- A. specific activity
- B. relative activity
- C. purity ratio
- D. all of these Discuss
- 4. Which of the following step is assumed to be the slowest step in the Michaelis Menten equation?
Options- A. The substrate consuming step
- B. The product releasing step
- C. Formation of enzyme substrate complex
- D. None of these Discuss
- 5. If a reaction occurs in the absence of inhibitor with rate ?0 and in the presence of inhibitor with rate ?i, the degree of inhibition is defined as
Options- A. (?0 - ?i)/?0
- B. (?0 + ?i)/?0
- C. (?0?i)/?0
- D. (?0-?i)/?i Discuss
- 6. A classical noncompetitive inhibitor has
Options- A. no effect on substrate binding
- B. no effect on substrate binding and vice versa
- C. significant effect on substrate binding
- D. significant effect on substrate binding and vice versa Discuss
- 7. The rate equation in non-competitive inhibition based on Michaelis Menten equation is given by
Options- A. rmaxS/(Km + S)(1+I/Ki)
- B. rmaxE/(Km (1+I/Ki)+S))
- C. VmaxS/(Km + S)(1+I/Ki)
- D. rmaxS/Km Discuss
- 8. The initial velocity, V0, of an enzyme catalyzed reaction reaches Vmax as
Options- A. [S] = KM
- B. [S] = 10 * KM
- C. 1/[S] = 1/KM
- D. 1/[S] ? 0 Discuss
- 9. The active site of an enzyme differs from an antibody-antigen binding site in that the enzyme active site
Options- A. contains modified amino acids
- B. catalyzes a chemical reaction
- C. is complementary to a specific ligand
- D. contains amino acids without side chains Discuss
- 10. Enzymes are basically
Options- A. proteins
- B. vitamins
- C. fat
- D. carbohydrates Discuss
Enzymes and Kinetics problems
Search Results
Correct Answer: competitive inhibition is greater than uncompetitive inhibition
Correct Answer: Isomerases
Correct Answer: specific activity
Correct Answer: The product releasing step
Correct Answer: (?0 - ?i)/?0
Correct Answer: no effect on substrate binding and vice versa
Correct Answer: rmaxS/(Km + S)(1+I/Ki)
Correct Answer: 1/[S] ? 0
Correct Answer: catalyzes a chemical reaction
Correct Answer: proteins
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