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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • Chemostats work on the principle of


  • Options
  • A. maintaining constant volume of culture medium
  • B. maintaining continuous flow of nutrients
  • C. maintaining uniform nutrients concentration
  • D. operating at higher pressure

  • Correct Answer
  • maintaining uniform nutrients concentration 


  • Fermentation Kinetics problems


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    • 1. The function of the disengagement zone in an airlift fermenter is to

    • Options
    • A. prevent CO2 rich bubbles from entering the downcomer
    • B. reduce the velocity of the bubbles
    • C. reduce liquid loss as aerosols
    • D. all of the above
    • Discuss
    • 2. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the

    • Options
    • A. downcomer
    • B. disengagement zone
    • C. air riser
    • D. flotsam
    • Discuss
    • 3. 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
    • 4. 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
    • 5. Fermentor should be filled with medium upto

    • Options
    • A. 65-70%
    • B. 70-75%
    • C. 75-80%
    • D. 80-85%
    • Discuss
    • 6. Population doubling time, td can be expressed as (where ? is the specific growth rate.)

    • Options
    • A. log2/?
    • B. ln2/?
    • C. ?/ln2
    • D. ?/log2
    • Discuss
    • 7. The monod model predicts that the specific growth rate

    • Options
    • A. will increase with the concentration of the growth limiting substrate until it reaches a maximum value
    • B. will decrease with the concentration of the growth limiting substrate
    • C. will increase with the concentration of the growth limiting substrate
    • D. does not depend on growth limiting substrate
    • Discuss
    • 8. The specific growth rate (?) is defined as

    • Options
    • A. the concentration of biomass in the reactor
    • B. rate of increase of total biomass in a reactor
    • C. the rate of individual cells division or increase in their biomass
    • D. the rate of cell death
    • Discuss
    • 9. During the exponential phase the maximum specific growth rate equals specific growth rate as

    • Options
    • A. concentration of the growth limiting substrate is much less than the monod constant
    • B. concentration of growth limiting substrate is much greater than the monod constant
    • C. specific growth rate increases exponentially
    • D. concentration of the growth limiting substrate is equal to the monod constant
    • Discuss
    • 10. The function of a mechanical seal is to

    • Options
    • A. prevent contaminants entering the reactor
    • B. prevent cells from leaving the reactor
    • C. both (a) and (b)
    • D. prevent air to enter
    • Discuss


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