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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. A pseudoplastic fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with increasing stirrer speed
- D. decreases with increasing stirrer speed Discuss
- 2. Which of the following is an example of a mathematical model?
Options- A. Volume of cuboid = length x breadth x height
- B. The Monod Model
- C. The Michaelis Menten Equation
- D. All of the above Discuss
- 3. Typical aeration rates for aerobic fermentation are
Options- A. 0 - 0.5 vvm
- B. 0.5 - 1.0 vvm
- C. 1.0 - 1.5 vvm
- D. 1.5 - 2.0 vvm Discuss
- 4. If the solute passes through membrane freely, the the rejection coefficient (s) is
Options- A. 1
- B. 0
- C. >1
- D. <1 Discuss
- 5. In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be
Options- A. 0 g.l-1h-1
- B. 0.5 g.l-1h-1
- C. 1 g.l-1h-1
- D. 2 g.l-1h-1 Discuss
- 6. If the membrane rejects all solute, the rejection coefficient (s) is
Options- A. 1
- B. 0
- C. >1
- D. <1 Discuss
- 7. In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?
Options- A. 50 g maltose.l-1
- B. 50 g lactate.l-1
- C. 200 g maltose.l-1
- D. 200 g lactate.l-1 Discuss
- 8. Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because
Options- A. cells will redirect ATP to anabolism
- B. cells will redirect NAD+ to anabolism
- C. cells will redirect ATP to facilitate the diffusion of lactic acid and H+ out of the cells
- D. cells will redirect ATP to the active transport of lactic acid and H+ out of the cells Discuss
- 9. Fermentor should be filled with medium upto
Options- A. 65-70%
- B. 70-75%
- C. 75-80%
- D. 80-85% Discuss
- 10. Which category of enzymes belongs to class two in the international classification?
Options- A. Hydrolases
- B. Ligases
- C. Transferases
- D. Isomerase Discuss
More questions
Correct Answer: decreases with increasing stirrer speed
Correct Answer: All of the above
Correct Answer: 0.5 - 1.0 vvm
Correct Answer: 0
Correct Answer: 0 g.l-1h-1
Correct Answer: 1
Correct Answer: 200 g lactate.l-1
Correct Answer: cells will redirect ATP to the active transport of lactic acid and H+ out of the cells
Correct Answer: 75-80%
Correct Answer: Transferases
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