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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • Stationary phase is described as


  • Options
  • A. no further increase in the cell population after a maximum value
  • B. deceleration of growth and division rate after the growth rate reaches a maximum
  • C. acceleration of growth and division rate after the growth rate reaches a maximum
  • D. deceleration of growth and division rate after the growth rate reaches a minimum

  • Correct Answer
  • no further increase in the cell population after a maximum value 


  • Fermentation Kinetics problems


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    • 1. The high oxygen transfer efficiencies of airlift bioreactors is due to

    • Options
    • A. the large aspect ratio of the reactor, which leads to a high gas hold-up
    • B. the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor
    • C. the draft tube, which reduces bubble coalescence in the reactor
    • D. all of the above
    • Discuss
    • 2. A higher Ks value of Monod's equation means

    • Options
    • A. greater affinities to substrate
    • B. lower affinities to substrate
    • C. unaffected with the substrate bonding
    • D. lower dissociation constant value
    • Discuss
    • 3. The maximum specific growth rate of an organism depends on

    • Options
    • A. medium composition
    • B. temperature
    • C. pH
    • D. All of these
    • Discuss
    • 4. 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
    • Discuss
    • 5. The enzyme used to reduce bitterness of grapes commonly contains

    • Options
    • A. ?-L-rhamonosidase
    • B. ?-d-glucosidase
    • C. ?- galactosidase
    • D. both (a) and (b)
    • Discuss
    • 6. Which of the following is correct for the prediction of time requirement in a batch fermenter?

    • Options
    • A. Carrying out experiments
    • B. Mathematical modelling of the fermentation process
    • C. Both (a) and (b)
    • D. It is impossible to predict the time required for fermentation
    • Discuss
    • 7. Heat transfer rates (per unit volume) will be lowest in

    • Options
    • A. Stirred tank bioreactor with biomass recycle
    • B. Continuous air lift bioreactor
    • C. Continuous packed bed reactor
    • D. Continuous fluidized bed bioreactor
    • Discuss
    • 8. The number of baffles in a standard stirred tank bioreactor is

    • Options
    • A. 8
    • B. 6
    • C. 4
    • D. 2
    • Discuss
    • 9. Bacterial growth curve is obtained by plotting

    • Options
    • A. number of cells versus time
    • B. number fo spores versus time
    • C. log of number of cells versus time
    • D. log of number of cells survived versus time
    • Discuss
    • 10. The contents in jet loop reactor are mixed through

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


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