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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • The contents in stirred tank rector are mixed through


  • Options
  • A. compressed air
  • B. a mechanical agitator
  • C. external pumping
  • D. any of these

  • Correct Answer
  • a mechanical agitator 


  • Fermentation Kinetics problems


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    • 1. 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
    • 2. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is

    • Options
    • A. higher oxygen transfer rates
    • B. more uniform shear conditions
    • C. both (a) and (b)
    • D. less foaming
    • Discuss
    • 3. The diameter of the baffles in a standard stirred tank bioreactor ranges from

    • Options
    • A. 1/10th - 1/12th of the tank diameter
    • B. 1/3rd - 1/4th of the tank diameter
    • C. 1/15th - 1/20th of the tank diameter
    • D. 1/20th - 1/25th of the tank diameter
    • Discuss
    • 4. During the log phase cell numbers increase exponentially

    • Options
    • A. because cells produce enzymes
    • B. because cells do not have cell membranes
    • C. because cells are autocatalysts
    • D. because the rate of cell division increases exponentially
    • Discuss
    • 5. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.

    • Options
    • A. continuous
    • B. batch
    • C. fed-batch
    • D. semi continuous
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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)
    • Discuss
    • 10. 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


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