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- Question
The production of an amylase from starch by Aspergillus niger is often performed in a fed batch fermenter. This is due to the reason that
Options- A. fed-batch reactor can be used to minimize starch concentrations and prevent a. niger from fermenting
- B. fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
- C. continuous reactor can be used to minimize starch concentrations and their inhibitory effects
- D. all of the above
- Correct Answer
- fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
- 1. In a batch reactor specific growth rate
Options- A. remains constant throughout the process
- B. increases exponentially
- C. changes during the fermentation
- D. is highest during the stationary phase Discuss
- 2. The specific growth rate is affected by
Options- A. sabstrate concentration
- B. product concentration
- C. oxygen supply
- D. all of these Discuss
- 3. The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation Discuss
- 4. The main function(s) of a draft tube in an air lift fermenter is/are to
Options- A. increase the solubility of oxygen
- B. distribute shear forces throughout the reactor and minimise bubble coalescence
- C. concentrate shear forces around the sparger
- D. concentrate shear forces near the disengagement zone Discuss
- 5. Tower fermentors are used for
Options- A. continuous penicillin production
- B. continuous beer production
- C. production of enzymes
- D. batch production of beer Discuss
- 6. Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
Options- A. High concentration of dissolved oxygen
- B. Low concentration of dissolved oxygen
- C. No effect of dissolved oxygen
- D. High concentration of dissolved oxygen and sodium salts Discuss
- 7. In a fluidized bed reactor mixing is achieved by
Options- A. gravity flow of fluid
- B. upward movement of the incoming feed
- C. diffusion
- D. both (a) and (b) Discuss
- 8. A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is
Options- A. 1.5 g
- B. 2.2 g
- C. 3.0 g
- D. 6.0 g Discuss
- 9. A strain of Escherichia coli has a maximum specific growth rate of 0.8 h-1 on a glucose based medium. If this organism is being grown in a chemostat with a dilution rate of 1.2 h-1, then at steady state the concentration of E. coli in the same medium will
Options- A. increase
- B. be zero
- C. change randomly
- D. decrease Discuss
- 10. Which of the following is best described as secondary metabolite?
Options- A. Acetic acid produced from the oxidation of ethanol
- B. Ethanol from the fermentation of glucose
- C. Penicillin
- D. Citric acid from the partial oxidation of glucose Discuss
Fermentation Reactors problems
Search Results
Correct Answer: changes during the fermentation
Correct Answer: all of these
Correct Answer: aerobic fermentations
Correct Answer: distribute shear forces throughout the reactor and minimise bubble coalescence
Correct Answer: continuous beer production
Correct Answer: No effect of dissolved oxygen
Correct Answer: both (a) and (b)
Correct Answer: 2.2 g
Correct Answer: be zero
Correct Answer: Penicillin
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