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- Question
When Escherichia coli grow in a well aerated medium, which of the following will occur?
Options- A. Fructose di-phosphate accumulation inside the cells leading to cell respiration
- B. Fructose di-phosphate accumulation inside the cells leading to fermentation
- C. Fructose di-phosphate will accumulate regardless of the medium composition
- D. Fructose di-phosphate will accumulate inside the cells leading to anaerobic respiration
- Correct Answer
- Fructose di-phosphate accumulation inside the cells leading to fermentation
- 1. The ideal tubular-flow fermenter without radial variations is called a
Options- A. plug flow fermenter
- B. continuous stirred tank fermenter (CSTF)
- C. column fermenter
- D. any intensity of dilution rate near the wash out points Discuss
- 2. In plug flow tubular reactor the axial velocity profile on cross-section will be
Options- A. constant
- B. varying with time
- C. non-linear
- D. power function of time Discuss
- 3. 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
- 4. The fastest route of NADH reoxidation is
Options- A. aerobic respiration
- B. anaerobic respiration
- C. fermentation
- D. decomposition Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Fermentation Reactors problems
Search Results
Correct Answer: plug flow fermenter
Correct Answer: constant
Correct Answer: Approximately 20 g dry weight per litre
Correct Answer: fermentation
Correct Answer: X and P will be zero while S is equal to the substrate concentration in feed
Correct Answer: less than 0.8 h-1
Correct Answer: Pseudomonas aeruginosa
Correct Answer: only at the end of the fermentation process
Correct Answer: concentration oscillate around a mean value
Correct Answer: are located near entrance of feed
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