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- Question
In the death phase
Options- A. nutrients available for the cells are depleted and begin to die
- B. the number of viable cells will increase
- C. nutrients available for cells are replenished and start to multiply
- D. none of the above
- Correct Answer
- nutrients available for the cells are depleted and begin to die
- 1. Fermentor should be filled with medium upto
Options- A. 65-70%
- B. 70-75%
- C. 75-80%
- D. 80-85% Discuss
- 2. Bubble column reactor has
Options- A. large height to diameter ratio
- B. small height to diameter ratio
- C. large diameter to height ratio
- D. small diameter to height ratio Discuss
- 3. The function(s) of the draft tube in an airlift bioreactor is
Options- A. to reduce bubble coalescence
- B. to improve circulation
- C. to even out shear conditions throughout the reactor
- D. all of the above Discuss
- 4. 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
- 5. 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
- 6. When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.
Options- A. permeabilize
- B. lyophilize
- C. heat-kill
- D. denature Discuss
- 7. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. flotsam Discuss
- 8. The function of the disengagement zone in an airlift fermenter is to
Options- A. prevent CO2 rich bubbles from entering the downcomer
- B. reduce the velocity of the bubbles
- C. reduce liquid loss as aerosols
- D. all of the above Discuss
- 9. Chemostats work on the principle of
Options- A. maintaining constant volume of culture medium
- B. maintaining continuous flow of nutrients
- C. maintaining uniform nutrients concentration
- D. operating at higher pressure Discuss
- 10. Population doubling time, td can be expressed as (where ? is the specific growth rate.)
Options- A. log2/?
- B. ln2/?
- C. ?/ln2
- D. ?/log2 Discuss
Fermentation Kinetics problems
Search Results
Correct Answer: 75-80%
Correct Answer: large height to diameter ratio
Correct Answer: all of the above
Correct Answer: disengagement zone
Correct Answer: turbidostat
Correct Answer: permeabilize
Correct Answer: downcomer
Correct Answer: all of the above
Correct Answer: maintaining uniform nutrients concentration
Correct Answer: ln2/?
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