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Home Biochemical Engineering Immobilized Enzyme Comments

  • Question
  • The covalent attachment of enzyme molecules is via


  • Options
  • A. nonessential amino acids residues to water insoluble, functional supports
  • B. essential amino acids residues to water insoluble, functional supports
  • C. nonessential amino acids residues to water soluble, functional supports
  • D. essential amino acids residues to water soluble, functional supports

  • Correct Answer
  • nonessential amino acids residues to water insoluble, functional supports 


  • Immobilized Enzyme problems


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    • 1. Which of the following is taken as an assumption in the distributed model?

    • Options
    • A. The reaction occurs at every position and the kinetics of the reaction are of the same form as observed for free enzyme.
    • B. Mass transfer through the immobilized enzyme occurs via molecular diffusion
    • C. There is no mass transfer limitation at the outside surface of the spherical immobilized enzyme
    • D. All of the above
    • Discuss
    • 2. Functional groups of the nonessential amino acid residues that are suitable for the immobilization process are

    • Options
    • A. free ?-, ?- or ? carb oxyl groups
    • B. ? or ? amino groups
    • C. phenyl, hydroxyl, sulfhydryl or imidazole groups
    • D. all of the above
    • Discuss
    • 3. During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is

    • Options
    • A. equal to that of substrate consumption
    • B. more than that of substrate consumption
    • C. lesser than that of substrate consumption
    • D. is nothing to do with the substrate consumption
    • Discuss
    • 4. The immobilized technique involving chemical 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
    • 5. Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have

    • Options
    • A. low molecular weight
    • B. high molecular weight
    • C. high equivalent weight
    • D. low reactivity
    • Discuss
    • 6. For glucose isomerization by immobilized enzyme, the reactor generally used is

    • Options
    • A. CSTR
    • B. plug flow
    • C. packed bed
    • D. fluidized bed
    • Discuss
    • 7. The effectiveness factor increases with the

    • Options
    • A. increase of diffusivity and decreased with the increase of particle size
    • B. increase of diffusivity and increased with the increase of particle size
    • C. decrease of diffusivity and decreased with the increase of particle size
    • D. increase of diffusivity and decrease with the decrease of particle size
    • Discuss
    • 8. The most commonly employed cross-linked polymer is the

    • Options
    • A. polyacrylamide gel
    • B. collagen
    • C. celluloses
    • D. cation exchange resin
    • Discuss
    • 9. Which of the following is considered as a disadvantage to the adsorption method of immobilization?

    • Options
    • A. It is possible to separate and purify the enzymes while being immobilized
    • B. The enzymes are not usually deactivated by adsorption
    • C. The adsorption is a reversible process
    • D. State of immobilization is very sensitive to solution pH, ionic strength and temperature
    • Discuss
    • 10. The immobilized enzyme produced by micro encapsulation technique provides

    • Options
    • A. an extremely large surface area
    • B. smaller surface area
    • C. high amount of solvent
    • D. relatively smaller surface area
    • Discuss


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