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  • Question
  • 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

  • Correct Answer
  • because cells are autocatalysts 


  • Fermentation Kinetics problems


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    • 1. 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
    • 2. In wastewater treatment, which bioreactor is generally used?

    • Options
    • A. Plug flow reactor
    • B. Trickle bed reactor
    • C. Tower fermentor
    • D. CSTR
    • Discuss
    • 3. The height to diameter ratio (H/D) for the tank fermenters is

    • Options
    • A. <3
    • B. >3
    • C. <1.5
    • D. >1.5
    • Discuss
    • 4. 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
    • 5. 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
    • Discuss
    • 6. The diameter of the baffles in a standard stirred tank bioreactor ranges from

    • Options
    • A. 1/10th - 1/12th of the tank diameter
    • B. 1/3rd - 1/4th of the tank diameter
    • C. 1/15th - 1/20th of the tank diameter
    • D. 1/20th - 1/25th of the tank diameter
    • Discuss
    • 7. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is

    • Options
    • A. higher oxygen transfer rates
    • B. more uniform shear conditions
    • C. both (a) and (b)
    • D. less foaming
    • Discuss
    • 8. During the lag phase

    • Options
    • A. cells just start growing
    • B. cells synthesize new proteins and membrane components
    • C. cells produce antibiotics to kill competing organisms
    • D. cells simply grow slowly
    • Discuss
    • 9. The contents in stirred tank rector are mixed through

    • Options
    • A. compressed air
    • B. a mechanical agitator
    • C. external pumping
    • D. any of these
    • Discuss
    • 10. To describe components of an airlift bioreactor which of the follow-ings are generally included?

    • Options
    • A. Disengagement zone, air riser, downcomer
    • B. Flotsam, jetsam, downzone
    • C. Air comer, disentanglement zone, downsizer
    • D. All of the above
    • Discuss


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