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Home Biochemical Engineering Immobilized Enzyme Comments

  • Question
  • If Damkohler number, NDa >>1, the reaction rate is much greater than the mass transfer rate and the overall reaction is controlled by the rate of mass transfer. In this case, the enzyme reaction can be described as (where Csb and Cs are the substrate concentration in bulk of solution and at the immobilized enzyme surface respectively. ks mass transfer coefficient, and a is the surface area of an immobilized enzyme particles)


  • Options
  • A. rp = ksa(Csb-Cs)
  • B. rp = ksaCsb
  • C. rp = ksaCs
  • D. rp = ksa(Csb+Cs)

  • Correct Answer
  • rp = ksaCsb 


  • Immobilized Enzyme problems


    Search Results


    • 1. Damkohler number(NDa) is

    • Options
    • A. the ratio of the maximum reaction rate to the maximum mass transfer rate
    • B. the ratio of the minimum reaction rate to the maximum mass transfer rate
    • C. the ratio of the maximum reaction rate to the minimum mass transfer rate
    • D. the ratio of the minimum reaction rate to the minimum mass transfer rate
    • Discuss
    • 2. Which of the following is not a physical method of immobilization?

    • Options
    • A. Adsorption
    • B. Entrapment
    • C. Micro encapsulation
    • D. None of these
    • Discuss
    • 3. Which medium is used for the production of Penicillin using immobilized cells

    • Options
    • A. 1% peptone medium
    • B. glucose medium
    • C. Yeast extract medium
    • D. LB broth
    • Discuss
    • 4. Various techniques are available for determining the effective diffusivity of solute in gel. Thin disk method uses

    • Options
    • A. a diffusion cell with two compartments divided by a thin gel
    • B. a diffusion cell with two compartments
    • C. a diffusion cell with two compartments plus by a thin gel
    • D. a diffusion cell with two compartments multiply by a thin gel
    • Discuss
    • 5. Which of the following is the commonly employed adsorbents?

    • Options
    • A. Calcium carbonate
    • B. Alumina
    • C. Celluloses
    • D. All of these
    • Discuss
    • 6. Which of the following is not the correct answer?

    • Options
    • A. Immobilized enzyme may show selectively altered chemical properties
    • B. Immobilized enzyme may show selectively altered physical properties
    • C. Immobilized enzyme may simulate the realistic natural environment where the enzyme come from the cell
    • D. None of the above
    • Discuss
    • 7. The immobilization technique involving physical method is

    • Options
    • A. covalent bond formation dependent
    • B. non-covalent bond formation dependent
    • C. both (a) and (b)
    • D. ionic bond formation dependent
    • Discuss
    • 8. Commonly employed water insoluble supports for the covalent attachment of enzyme include

    • Options
    • A. acrylamide based polymers
    • B. polypeptides
    • C. dextran
    • D. all of these
    • Discuss
    • 9. For a steady state condition, the change of substrate concentration (dCs/dt) is

    • Options
    • A. zero
    • B. 1
    • C. >1
    • D. <1
    • Discuss
    • 10. To measure the extent to which the reaction rate is lowered because of resistance to mass transfer, the effectiveness factor of an immobilized enzyme, ? can be defined as

    • Options
    • A. reaction rate/rate if not slowed by diffusion
    • B. rate if not slowed by diffusion/ reaction rate
    • C. actual reaction rate/ rate if not slowed by diffusion
    • D. rate if not slowed by diffusion/ actual reaction rate
    • Discuss


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