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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • In an airlift bioreactor, the spent gases released from the liquid are called


  • Options
  • A. downcomer
  • B. disengagement zone
  • C. air riser
  • D. flotsam

  • Correct Answer
  • disengagement zone 


  • Fermentation Kinetics problems


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    • 1. An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a

    • Options
    • A. manostat
    • B. chemostat
    • C. turbidostat
    • D. culturostat
    • Discuss
    • 2. The phenomenon in which substrates are used in a sequential manner is known as

    • Options
    • A. trans-substrate genesis
    • B. dialism
    • C. diauxie
    • D. multiplicity
    • Discuss
    • 3. The maximum specific growth rate (?m) of an organism in batch culture is equal to slope of a plot of

    • Options
    • A. In [biomass] against time for exponential phase data only
    • B. In [biomass] against time
    • C. biomass against time
    • D. biomass against time for stationary phase data only
    • Discuss
    • 4. Diauxie is

    • Options
    • A. growth factors
    • B. microbiological die off
    • C. the simultaneous uptake of nutrients
    • D. the stagewise uptake of nutrients
    • Discuss
    • 5. A mixed fermentation is one, which produces

    • Options
    • A. both alcohol and carbon dioxide
    • B. both acid and carbon dioxide
    • C. both acid and alcohol
    • D. several different kinds of acid
    • Discuss
    • 6. The function(s) of the draft tube in an airlift bioreactor is

    • Options
    • A. to reduce bubble coalescence
    • B. to improve circulation
    • C. to even out shear conditions throughout the reactor
    • D. all of the above
    • Discuss
    • 7. Bubble column reactor has

    • Options
    • A. large height to diameter ratio
    • B. small height to diameter ratio
    • C. large diameter to height ratio
    • D. small diameter to height ratio
    • Discuss
    • 8. Fermentor should be filled with medium upto

    • Options
    • A. 65-70%
    • B. 70-75%
    • C. 75-80%
    • D. 80-85%
    • Discuss
    • 9. In the death phase

    • Options
    • A. nutrients available for the cells are depleted and begin to die
    • B. the number of viable cells will increase
    • C. nutrients available for cells are replenished and start to multiply
    • D. none of the above
    • Discuss
    • 10. When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.

    • Options
    • A. permeabilize
    • B. lyophilize
    • C. heat-kill
    • D. denature
    • Discuss


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