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- Question
What is the effect of the concentration of dissolved salts and sugars on the oxygen transfer rate?
Options- A. The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
- B. The KLa of the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
- C. The KLa of the medium increases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
- D. None of the above
- Correct Answer
- The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate
- 1. Start up expenses in a fermentation industry varies from
Options- A. 0-5% of the capital cost
- B. 10-15% of the capital cost
- C. 5-10% of the capital cost
- D. 15-20% of the capital cost Discuss
- 2. Given an enzyme with a Km = 10m M and Vmax = 100 m mol/min. If [S] = 100 m M, which of the following will be true?
Options- A. A 10 fold increase in Vmax would increase velocity 10 fold y
- B. A 10 fold decrease in Km would increase velocity
- C. Both (a) and (b)
- D. A 10 fold increase in Vmax would decrease velocity 20 fold Discuss
- 3. During fermentation, the saturation concentration of oxygen was reduced from 7 ppm. to 1 ppm. Which one of the following conclusions can be drawn?
Options- A. Microbial growth is oxygen limited since the oxygen concentration is lesser than the saturation concentration
- B. Microbial growth is not oxygen limited since the oxygen concentration is lesser than the saturation concentration
- C. Experimental error leads to the reduction
- D. No conclusion can be drawn Discuss
- 4. Power consumption by agitation is
Options- A. a function of physical properties
- B. a function of operating conditions
- C. a function of vessel and impeller geometry
- D. all of the above Discuss
- 5. The rate equation in non-competitive inhibition based on Michaelis Menten equation is given by
Options- A. rmaxS/(Km + S)(1+I/Ki)
- B. rmaxE/(Km (1+I/Ki)+S))
- C. VmaxS/(Km + S)(1+I/Ki)
- D. rmaxS/Km Discuss
- 6. The rate equation in competitive inhibition based on Michaelis Menten equation is given by
Options- A. rmaxS/(Km (1+I/Ki)+S))
- B. rmaxE/(Km (1+I/Ki)+S))
- C. rmaxI/(Km (1+I/Ki)+S))
- D. rmaxS/(Km (1+I/Ki)) Discuss
- 7. 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
- 8. 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
- 9. A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was
Options- A. 2g
- B. 6g
- C. 8g
- D. 12g Discuss
- 10. In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
Options- A. Citric acid is toxic to the cells
- B. Alkanes cause foaming
- C. Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- D. Fast addition of alkanes will cause the cells to grow too quickly Discuss
More questions
Correct Answer: 5-10% of the capital cost
Correct Answer: A 10 fold increase in Vmax would increase velocity 10 fold y
Correct Answer: No conclusion can be drawn
Correct Answer: all of the above
Correct Answer: rmaxS/(Km + S)(1+I/Ki)
Correct Answer: rmaxS/(Km (1+I/Ki)+S))
Correct Answer: Penicillin
Correct Answer: The continuous cultures is very useful for the production of pharmaceuticals
Correct Answer: 6g
Correct Answer: Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
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