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Home Biochemical Engineering Fermentation Kinetics Comments

  • Question
  • 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

  • Correct Answer
  • both acid and alcohol 


  • Fermentation Kinetics problems


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    • 1. Which of the following is an example of a mathematical model?

    • Options
    • A. Volume of cuboid = length x breadth x height
    • B. The Monod Model
    • C. The Michaelis Menten Equation
    • D. All of the above
    • Discuss
    • 2. The dilution rate, D is defined as(where F = volumetric flow rate, VR = total volume of culture in the reactor and ? specific growth rate)

    • Options
    • A. F/VR
    • B. VR/F
    • C. ?/F
    • D. F/?
    • Discuss
    • 3. Biomass concentrations during fermentation is

    • Options
    • A. diluting the samples to optical density less than 0.3
    • B. monitored by controlling the changes in biomass concentrations
    • C. considering that optical density is proportional to the surface area of the biomass in the sample
    • D. all of the above
    • Discuss
    • 4. In the stationary phase

    • Options
    • A. growth is proportional to death
    • B. growth rate is equal to death rate
    • C. growth rate is lesser than death rate
    • D. no co-relation exist between death rate and growth rate
    • Discuss
    • 5. The height to diameter ratio (H/D) for the column fermenters is

    • Options
    • A. <3
    • B. >3
    • C. <1.5
    • D. >1.5
    • Discuss
    • 6. Diauxie is

    • Options
    • A. growth factors
    • B. microbiological die off
    • C. the simultaneous uptake of nutrients
    • D. the stagewise uptake of nutrients
    • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. In an airlift bioreactor, the spent gases released from the liquid are called

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


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