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  • Question
  • The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of


  • Options
  • A. higher oxygen transfer rates
  • B. a small sparge ring
  • C. better heat transfer efficiencies
  • D. all of these

  • Correct Answer
  • better heat transfer efficiencies 


  • Fermentation Kinetics problems


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    • 1. Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?

    • Options
    • A. The average bubble size is smaller in an airlift bioreactor
    • B. Oxygen transfer rate is higher in an airlift bioreactor
    • C. The surface area for gas exchange is higher in an airlift bioreactor
    • D. All of the above
    • Discuss
    • 2. Stirred tank fermenter (STF) can be employed for

    • Options
    • A. aerobic fermentation of a wide range of cells including microbial, animal and plant cells
    • B. anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
    • C. Both (a) and (b)
    • D. anaerobic fermentation of plant cells only
    • Discuss
    • 3. The optical density sometimes drops during the lag phase because

    • Options
    • A. cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
    • B. of fast cell growth causing them to fill up with DNA
    • C. cells swell up with water
    • D. cells swell up with RNA
    • Discuss
    • 4. Which of the following(s) is/are considered the limitations of the exponential growth model?

    • Options
    • A. Only predicts that cells grow exponentially during the log phase
    • B. It does not consider factors that causes cells growth to stop or slow
    • C. Predicts cell growth at a linear rate
    • D. All of the above
    • Discuss
    • 5. 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
    • 6. The application of just in time (JIT) manufacturing techniques in biotechnology is important because

    • Options
    • A. raw materials used in biotechnology are biodegradable
    • B. the products of biotechnology are biodegradable
    • C. it is a very competitive business (d) all of the above
    • D. all of the above
    • Discuss
    • 7. The height to diameter ratio (H/D) for the tank fermenters is

    • Options
    • A. <3
    • B. >3
    • C. <1.5
    • D. >1.5
    • Discuss
    • 8. In wastewater treatment, which bioreactor is generally used?

    • Options
    • A. Plug flow reactor
    • B. Trickle bed reactor
    • C. Tower fermentor
    • D. CSTR
    • Discuss
    • 9. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.

    • Options
    • A. continuous
    • B. batch
    • C. fed-batch
    • D. semi continuous
    • Discuss
    • 10. During the log phase cell numbers increase exponentially

    • Options
    • A. because cells produce enzymes
    • B. because cells do not have cell membranes
    • C. because cells are autocatalysts
    • D. because the rate of cell division increases exponentially
    • Discuss


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