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Home Biochemical Engineering Enzymes and Kinetics Comments

  • Question
  • 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

  • Correct Answer
  • the rate at which the enzyme can convert substrate to product 


  • Enzymes and Kinetics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Which of the following statement(s) regarding enzymes, is/are false?

    • Options
    • A. Enzymes are always proteins that function as catalysts
    • B. Enzymes provide activation energy for reactions
    • C. Enzyme activity can be regulated
    • D. Enzymes may be used many times for a specific reaction
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Which category of enzymes belongs to class 5 in the international classification?

    • Options
    • A. Hydrolases
    • B. Isomerases
    • C. Oxido-reductases
    • D. Cyclase
    • Discuss
    • 10. 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


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