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- Question
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
- Correct Answer
- downcomer
- 1. 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
- 2. 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 Discuss
- 3. Fermentor should be filled with medium upto
Options- A. 65-70%
- B. 70-75%
- C. 75-80%
- D. 80-85% Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Population doubling time, td can be expressed as (where ? is the specific growth rate.)
Options- A. log2/?
- B. ln2/?
- C. ?/ln2
- D. ?/log2 Discuss
- 9. The monod model predicts that the specific growth rate
Options- A. will increase with the concentration of the growth limiting substrate until it reaches a maximum value
- B. will decrease with the concentration of the growth limiting substrate
- C. will increase with the concentration of the growth limiting substrate
- D. does not depend on growth limiting substrate Discuss
- 10. The specific growth rate (?) is defined as
Options- A. the concentration of biomass in the reactor
- B. rate of increase of total biomass in a reactor
- C. the rate of individual cells division or increase in their biomass
- D. the rate of cell death Discuss
Fermentation Kinetics problems
Search Results
Correct Answer: permeabilize
Correct Answer: nutrients available for the cells are depleted and begin to die
Correct Answer: 75-80%
Correct Answer: large height to diameter ratio
Correct Answer: all of the above
Correct Answer: all of the above
Correct Answer: maintaining uniform nutrients concentration
Correct Answer: ln2/?
Correct Answer: will increase with the concentration of the growth limiting substrate until it reaches a maximum value
Correct Answer: the rate of individual cells division or increase in their biomass
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