Fermentation Kinetics problems
- 1. 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
Correct Answer: better heat transfer efficiencies
- 2. 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
Correct Answer: all of the above
- 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
Correct Answer: <3
- 4. In wastewater treatment, which bioreactor is generally used?
Options- A. Plug flow reactor
- B. Trickle bed reactor
- C. Tower fermentor
- D. CSTR Discuss
Correct Answer: Trickle bed reactor
- 5. 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
Correct Answer: batch
- 6. 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
Correct Answer: because cells are autocatalysts
- 7. 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
Correct Answer: 1/10th - 1/12th of the tank diameter
- 8. 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
Correct Answer: both (a) and (b)
- 9. 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
Correct Answer: cells synthesize new proteins and membrane components
- 10. 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
Correct Answer: a mechanical agitator
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