Fermentation Reactors problems
- 1. 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 Discuss
Correct Answer: fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
- 2. 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
Correct Answer: No effect of dissolved oxygen
- 3. 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
Correct Answer: both (a) and (b)
- 4. 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
Correct Answer: 2.2 g
- 5. 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
Correct Answer: be zero
- 6. 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
Correct Answer: Penicillin
- 7. When the product formation is approximately equal to the rate of cell growth, the pattern of product formation is termed as
Options- A. uncoupled
- B. growth associated
- C. non-growth associated
- D. metabolically uncoupled Discuss
Correct Answer: growth associated
- 8. Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?
Options- A. X,S and P will be zero
- B. X,S and P can not be predicted for the above condition
- C. X and P will be zero while S is equal to the substrate concentration in feed
- D. None of the above Discuss
Correct Answer: X and P will be zero while S is equal to the substrate concentration in feed
- 9. The fastest route of NADH reoxidation is
Options- A. aerobic respiration
- B. anaerobic respiration
- C. fermentation
- D. decomposition Discuss
Correct Answer: fermentation
- 10. The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
Options- A. Greater than 20 g dry weight per litre
- B. Approximately 20 g dry weight per litre
- C. Lesser than 20 g dry weight per litre
- D. More than 30 g dry weight per litre Discuss
Correct Answer: Approximately 20 g dry weight per litre
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