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- Question
In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
Options- A. flow rate
- B. initial volume
- C. volume of solids in the reactor
- D. none of these
- Correct Answer
- flow rate
- 1. In a plug flow reactor, the highest concentration of substrates is exposed to the cells that
Options- A. are near the effluent or exit of the reactor
- B. are in the mid way along the reactor
- C. are located near entrance of feed
- D. are near the wall of the reactor Discuss
- 2. Pseudo-steady state in a continuous reactor refers to a reactor in which
Options- A. Pseudomonads are being cultured
- B. concentration oscillate around a mean value
- C. concentration increase with time
- D. concentration decrease with time Discuss
- 3. In the batch-fed mode, substrate will be added
Options- A. only at the beginning of the fermentation process
- B. periodically throughout the fermentation process
- C. only at the end of the fermentation process
- D. substrate is never added Discuss
- 4. Which of the following organisms will continue their metabolism at high substrate concentrations?
Options- A. Pseudomonas aeruginosa
- B. Saccharomyces cerevisiae
- C. Bacillus subtilis
- D. Escherichia coli Discuss
- 5. Pseudomonas aeruginosa has a maximum specific growth rate of 0.8 h-1 in a medium with glucose as a growth limiting substrate. To prevent wash out, the dilution rate must be set to
Options- A. greater than 0.8 h-1
- B. less than 0.8 h-1
- C. equal to 0.8 h-1
- D. 1.6 h-1 Discuss
- 6. Which of the following is not correct with regards to continuous cultures?
Options- A. The major industrial scale application of continuous cultures is in waste water treatment
- B. Mutation and contamination present a major risk to the operation of continuous cultures for the production of metabolites
- C. The continuous cultures is very useful for the production of pharmaceuticals
- D. Continuous cultures have an advantage that they do not need to shut down as regularly as batch culture reactor Discuss
- 7. Two continuous bioreactors containing the same organisms, fed with the same feed at the same dilution rate were compared. Reactor 1 started with an initial concentration of glucose of 10 g.l-1, while reactor 2 contained 0.1 g.l-1 of glucose at the start of the process then at steady state
Options- A. the concentration of glucose in reactor 1 would be greater than that in reactor 2
- B. the concentration of glucose in reactor 1 would be equal to reactor 2
- C. the concentration of glucose in reactor 1 would always be zero.
- D. the concentration of glucose in reactor 1 would be less than that in reactor 2 Discuss
- 8. In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour?
Options- A. 0.5 h-1
- B. 1.2 h-1
- C. 2.4 h-1
- D. 4 h-1 Discuss
- 9. The toxicity of organic acids to cells
Options- A. enhances as the pH falls
- B. reduces as the pH falls
- C. is not affected by pH
- D. is highest at pH 7.0 Discuss
- 10. A microorganism which is subjected to the Crabtree effect is most likely to
Options- A. ferment in the presence of low concentrations of sugar and dissolved oxygen
- B. respire in the presence of low sugar and high dissolved oxygen concentrations
- C. ferment in the presence of high concentrations of sugar and dissolved oxygen
- D. respire in the presence of high sugar and low dissolved oxygen concentrations Discuss
Fermentation Reactors problems
Search Results
Correct Answer: are located near entrance of feed
Correct Answer: concentration oscillate around a mean value
Correct Answer: only at the end of the fermentation process
Correct Answer: Pseudomonas aeruginosa
Correct Answer: less than 0.8 h-1
Correct Answer: The continuous cultures is very useful for the production of pharmaceuticals
Correct Answer: the concentration of glucose in reactor 1 would be equal to reactor 2
Correct Answer: 0.5 h-1
Correct Answer: enhances as the pH falls
Correct Answer: ferment in the presence of high concentrations of sugar and dissolved oxygen
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