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  • Question
  • 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

  • Correct Answer
  • competitive inhibition is greater than uncompetitive inhibition 


  • Enzymes and Kinetics problems


    Search Results


    • 1. Which category of enzymes belongs to class 5 in the international classification?

    • Options
    • A. Hydrolases
    • B. Isomerases
    • C. Oxido-reductases
    • D. Cyclase
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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