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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • If the specific growth rate, ?. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as


  • Options
  • A. Cn= Cn0 exp[? (t - t0)]
  • B. Cn0 = Cn exp[? (t - t0)]
  • C. Cn/Cn0 =(1/?)exp(t-t0)
  • D. Cn0 / Cn = (1/?)exp(t-t0)

  • Correct Answer
  • Cn= Cn0 exp[? (t - t0)] 


  • Fermentation Kinetics problems


    Search Results


    • 1. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in

    • Options
    • A. 1958
    • B. 1946
    • C. 1942
    • D. 1950
    • Discuss
    • 2. The contents in bubble column and air lift reactor are mixed through

    • Options
    • A. compressed air
    • B. a mechanical internal moving part
    • C. external pumping
    • D. any of these
    • Discuss
    • 3. 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
    • 4. The contents in stirred tank rector are mixed through

    • Options
    • A. compressed air
    • B. a mechanical agitator
    • C. external pumping
    • D. any of these
    • Discuss
    • 5. During the lag phase

    • Options
    • A. cells just start growing
    • B. cells synthesize new proteins and membrane components
    • C. cells produce antibiotics to kill competing organisms
    • D. cells simply grow slowly
    • Discuss
    • 6. An internal draft tube is preferrred to an external draft tube because

    • Options
    • A. it is easier to clean and sterilize a reactor
    • B. it is cheaper to build a reactor with an internal draft tube
    • C. Both (a) and (b)
    • D. none of the above
    • Discuss
    • 7. 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
    • 8. Turbidostat is recommended when continuous fermentation needs to be carried out at

    • Options
    • A. high dilution rates near the washout point
    • B. low dilution rates near the washout point
    • C. moderate dilution rates near the washout point
    • D. any intensity of dilution rates near the washout point
    • Discuss
    • 9. Tower fermentors are used for

    • Options
    • A. continuous penicillin production
    • B. continuous beer production
    • C. production of enzymes
    • D. batch production of beer
    • Discuss
    • 10. The main function(s) of a draft tube in an air lift fermenter is/are to

    • Options
    • A. increase the solubility of oxygen
    • B. distribute shear forces throughout the reactor and minimise bubble coalescence
    • C. concentrate shear forces around the sparger
    • D. concentrate shear forces near the disengagement zone
    • Discuss


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