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Home Biochemical Engineering Fermentation Kinetics See What Others Are Saying!
  • Question
  • The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which


  • Options
  • A. decreases the productivity of the fermenter
  • B. increases the productivity of the fermenter
  • C. modestly increases the productivity of the fermenter
  • D. does not affect on the productivity

  • Correct Answer
  • decreases the productivity of the fermenter 


  • More questions

    • 1. The water being used in dairy industry should contain not more than

    • Options
    • A. 5 proteolytic and/or lipolytic organisms per ml
    • B. 10 proteolytic and/or lipolytic organisms per ml
    • C. 15 proteolytic and/or lipolytic organisms per ml
    • D. 20 proteolytic and/or lipolytic organisms/ml
    • Discuss
    • 2. 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
    • 3. 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
    • 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. 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
    • 6. 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
    • 7. To describe components of an airlift bioreactor which of the follow-ings are generally included?

    • Options
    • A. Disengagement zone, air riser, downcomer
    • B. Flotsam, jetsam, downzone
    • C. Air comer, disentanglement zone, downsizer
    • D. All of the above
    • Discuss
    • 8. Detergent like substances produced by microorganisms during a fermentation will lead to

    • Options
    • A. decrease the surface tension of the liquid
    • B. accumulate at the gas liquid interface
    • C. decrease the rate of bubble coalescence
    • D. all of the above
    • Discuss
    • 9. Which of the following is incorrect?

    • Options
    • A. The mechanical agitation and aeration are effective for suspension of cells
    • B. The mechanical agitation and aeration are effective for mixing the medium
    • C. STF can't be used for high viscosity medium
    • D. The mechanical agitation and aeration are effective for oxygenation
    • Discuss
    • 10. In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as

    • Options
    • A. 0.1
    • B. 0.8
    • C. 0.25
    • D. 0.5
    • Discuss


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