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Home Biochemical Engineering Enzymes and Kinetics Comments

  • Question
  • Which of these enzymes contains a Zinc (Zn) ion?


  • Options
  • A. Carboxypeptidase A
  • B. Phosphorylase B kinase
  • C. Tyrosine hydroxylase
  • D. Phosphodiesterase

  • Correct Answer
  • Carboxypeptidase A 


  • Enzymes and Kinetics problems


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    • 1. Which graphical method is used to determine an enzyme degree of cooperativity?

    • Options
    • A. Hill plot
    • B. Koshland curve
    • C. Michaelis-Menten hyperbola
    • D. Can not be determined
    • Discuss
    • 2. The enzyme inhibition can occur by

    • Options
    • A. reversible inhibitors
    • B. irreversible inhibitors
    • C. Both (a) and (b)
    • D. None of these
    • Discuss
    • 3. In a Lineweaver-Burk Plot, competitive inhibitor shows which of the following effect?

    • Options
    • A. It moves the entire curve to right
    • B. It moves the entire curve to left
    • C. It changes the x-intercept
    • D. It has no effect on the slope
    • Discuss
    • 4. The active site of an enzyme remains

    • Options
    • A. at the center of globular proteins
    • B. rigid and does not change shape
    • C. complementary to the rest of the molecule
    • D. none of the above
    • Discuss
    • 5. The rate-determining step of Michaelis Menten kinetics is

    • Options
    • A. the complex formation step
    • B. the complex dissociation step to produce product
    • C. the product formation step
    • D. Both (a)and(c)
    • Discuss
    • 6. Non-competitive inhibitor of an enzyme catalyzed reaction

    • Options
    • A. decreases Vmax
    • B. binds to Michaelis complex (ES)
    • C. both (a) and (b)
    • D. can actually increase reaction velocity in rare cases
    • Discuss
    • 7. The effect of non-competitive inhibition on a Lineweaver-Burk Plot is that

    • Options
    • A. it can move the entire curve to the right
    • B. it can change the y-intercept
    • C. it can change the x-intercept
    • D. all of these
    • Discuss
    • 8. Which category of enzymes belongs to class two in the international classification?

    • Options
    • A. Hydrolases
    • B. Ligases
    • C. Transferases
    • D. Isomerase
    • Discuss
    • 9. Given an enzyme with a Km = 10m M and Vmax = 100 m mol/min. If [S] = 100 m M, which of the following will be true?

    • Options
    • A. A 10 fold increase in Vmax would increase velocity 10 fold y
    • B. A 10 fold decrease in Km would increase velocity
    • C. Both (a) and (b)
    • D. A 10 fold increase in Vmax would decrease velocity 20 fold
    • Discuss
    • 10. Lysozyme

    • Options
    • A. catalyses hydrolysis of ?-1-4 linkages between N-acetyl muranic acid and N-acetyl glucosamine in peptideoglycan
    • B. catalyses hydrolysis of ?-1-4 linkages between N-acetyl muranic acid and N-acetyl glucosamine in peptideoglycan
    • C. catalyses hydrolysis of ?-1-4 linkages between N-diacetyl muranic acid and N-diacetyl glucosamine in peptideoglycan
    • D. all of the above
    • Discuss


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