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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • Lag phase occurs mainly due to


  • Options
  • A. acclimatization with new environment and substrate
  • B. higher growth temperature
  • C. substrate disliking
  • D. variation in substrate concentration

  • Correct Answer
  • acclimatization with new environment and substrate 


  • Fermentation Kinetics problems


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    • 1. The rate equation in competitive inhibition based on Michaelis Menten equation is given by

    • Options
    • A. rmaxS/(Km (1+I/Ki)+S))
    • B. rmaxE/(Km (1+I/Ki)+S))
    • C. rmaxI/(Km (1+I/Ki)+S))
    • D. rmaxS/(Km (1+I/Ki))
    • Discuss
    • 2. Michaelis Menten equation can also be written as

    • Options
    • A. (-Cs)/r = (Cs/rmax)+(Km/rmax)
    • B. 1/r = (1/rmax)+(Km/(rmax.Cs))
    • C. r = rmax-(Km.r/Cs)
    • D. All of these
    • Discuss
    • 3. Lock and key theory is based on the compatibility of

    • Options
    • A. enzyme and substrate
    • B. enzyme and product
    • C. enzyme and enzyme substrate complex
    • D. enzyme substrate complex and product
    • Discuss
    • 4. Classical noncompetitive inhibition is obtained only under

    • Options
    • A. slow equilibrium conditions
    • B. moderate equilibrium conditions
    • C. rapid equilibrium conditions
    • D. non-equilibrium conditions
    • Discuss
    • 5. Enzymes are basically

    • Options
    • A. proteins
    • B. vitamins
    • C. fat
    • D. carbohydrates
    • Discuss
    • 6. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to

    • Options
    • A. increase the overall fermentation time
    • B. increase the overall yield of biomass
    • C. decrease the overall fermentation time
    • D. decrease the overall yield of product
    • Discuss
    • 7. In an airlift bioreactor, the air sparging region is called

    • Options
    • A. downcomer
    • B. disengagement zone
    • C. air riser
    • D. none of these
    • Discuss
    • 8. Residence time distribution (RTD) of a reactor is independent of

    • Options
    • A. micro mixing
    • B. volume of reactor
    • C. height of the reactor
    • D. width of the reactor
    • Discuss
    • 9. Concentration of the growth limiting substrate means

    • Options
    • A. trace elements concentration
    • B. the concentration of the substrate that controls the growth rate of the cells
    • C. sugar concentration in the fermentation medium
    • D. dissolved oxygen concentration
    • Discuss
    • 10. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the

    • Options
    • A. lag phase
    • B. stationary phase
    • C. death phase
    • D. exponential growth phase
    • Discuss


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