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- Question
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
- Correct Answer
- All of the above
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. The height to diameter ratio (H/D) for the tank fermenters is
Options- A. <3
- B. >3
- C. <1.5
- D. >1.5 Discuss
- 9. In wastewater treatment, which bioreactor is generally used?
Options- A. Plug flow reactor
- B. Trickle bed reactor
- C. Tower fermentor
- D. CSTR Discuss
- 10. 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
Fermentation Kinetics problems
Search Results
Correct Answer: Both (a) and (b)
Correct Answer: cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
Correct Answer: It does not consider factors that causes cells growth to stop or slow
Correct Answer: lag phase
Correct Answer: the concentration of the substrate that controls the growth rate of the cells
Correct Answer: better heat transfer efficiencies
Correct Answer: all of the above
Correct Answer: <3
Correct Answer: Trickle bed reactor
Correct Answer: batch
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