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- Question
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
- Correct Answer
- (?0 - ?i)/?0
- 1. When an enzyme is functioning at Vmax, the rate of the reaction is limited by
Options- A. the number of collisions between enzyme and substrate
- B. the number of substrate molecules in the reaction
- C. the concentration of the substrate
- D. the rate at which the enzyme can convert substrate to product Discuss
- 2. The usual method(s) to solve rate equation of simple enzyme kinetics is/are
Options- A. Michaelis Menten approach
- B. Briggs-Haldane approach
- C. Numerical solution approach
- D. all of these Discuss
- 3. For an enzyme that displays Michaelis-Menten kinetics, the reaction velocity (as a fraction of Vmax) observed at [S] = 2 KM will be
Options- A. 0.09
- B. 0.33
- C. 0.66
- D. 0.91 Discuss
- 4. An enzyme has a Km of 4.7 x 10-5M. If the Vmax of the preparation is 22m moles liter-1 min-1, what velocity would be observed in the presence of 2.0 x 10-4M substrate and 5.0 x 10-5M of a competitive inhibitor?
Options- A. 13.54? moles liter-1min-1
- B. 6.68? moles liter-1min-1
- C. 7.57? moles liter-1min-1
- D. 17.8? moles liter-1min-1 Discuss
- 5. The slope of Lineweaver Burk plot for Michaelis Menten equation is
Options- A. Vmax/Km
- B. Km/Vmax
- C. 1/Km
- D. Km.Vmax Discuss
- 6. 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
- 7. 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
- 8. Which category of enzymes belongs to class 5 in the international classification?
Options- A. Hydrolases
- B. Isomerases
- C. Oxido-reductases
- D. Cyclase Discuss
- 9. 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
- 10. 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 Discuss
Enzymes and Kinetics problems
Search Results
Correct Answer: the rate at which the enzyme can convert substrate to product
Correct Answer: all of these
Correct Answer: 0.66
Correct Answer: 13.54? moles liter-1min-1
Correct Answer: Km/Vmax
Correct Answer: The product releasing step
Correct Answer: specific activity
Correct Answer: Isomerases
Correct Answer: competitive inhibition is greater than uncompetitive inhibition
Correct Answer: 0.5 * Vmax
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