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Home Biochemical Engineering Enzymes and Kinetics Comments

  • Question
  • 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

  • Correct Answer
  • 1/[S] ? 0 


  • Enzymes and Kinetics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Which category of enzymes belongs to class 5 in the international classification?

    • Options
    • A. Hydrolases
    • B. Isomerases
    • C. Oxido-reductases
    • D. Cyclase
    • Discuss
    • 6. 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
    • 7. Enzymes are basically

    • Options
    • A. proteins
    • B. vitamins
    • C. fat
    • D. carbohydrates
    • Discuss
    • 8. Classical noncompetitive inhibition is obtained only under

    • Options
    • A. slow equilibrium conditions
    • B. moderate equilibrium conditions
    • C. rapid equilibrium conditions
    • D. non-equilibrium conditions
    • Discuss
    • 9. Lock and key theory is based on the compatibility of

    • Options
    • A. enzyme and substrate
    • B. enzyme and product
    • C. enzyme and enzyme substrate complex
    • D. enzyme substrate complex and product
    • Discuss
    • 10. Michaelis Menten equation can also be written as

    • Options
    • A. (-Cs)/r = (Cs/rmax)+(Km/rmax)
    • B. 1/r = (1/rmax)+(Km/(rmax.Cs))
    • C. r = rmax-(Km.r/Cs)
    • D. All of these
    • Discuss


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