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  • Question
  • 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

  • Correct Answer
  • concentration of growth limiting substrate is much greater than the monod constant 


  • Fermentation Kinetics problems


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    • 1. 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
    • 2. 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
    • 3. Population doubling time, td can be expressed as (where ? is the specific growth rate.)

    • Options
    • A. log2/?
    • B. ln2/?
    • C. ?/ln2
    • D. ?/log2
    • Discuss
    • 4. 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
    • Discuss
    • 5. 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
    • 6. 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
    • 7. The Monod Model relates

    • Options
    • A. substrate utilized with the biomass consumption
    • B. specific growth rate to the substrate availability
    • C. yield with the biomass utilization
    • D. the biomass concentration with specific growth rate
    • Discuss
    • 8. Which of the following describes the detrimental effect of bubbles on animal cells?

    • Options
    • A. Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
    • B. Cells trapped in the moving foam can be dragged apart by the bubbles
    • C. Both (a) and (b)
    • D. Bubbles can explode in the liquid medium causing the release of ultraviolet radiation
    • Discuss
    • 9. Water is a

    • Options
    • A. newtonian fluid
    • B. pseudoplastic
    • C. dilatant
    • D. rheopectic
    • Discuss
    • 10. A Newtonian fluid is one in which the viscosity

    • Options
    • A. is constant regardless of the stirrer speed or mixing time
    • B. changes during mixing but returns to its original state after mixing
    • C. increases with increasing stirrer speed
    • D. decreases with increasing stirrer speed
    • Discuss


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