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- Question
Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?
Options- A. Batch fermenter with a high initial glucose concentration
- B. Continuous fermenter with a low initial glucose concentration
- C. Fed batch fermenter
- D. All of the above
- Correct Answer
- Fed batch fermenter
- 1. The continuous cultures are not widely used in industry because
Options- A. they are not suited for the production of secondary metabolites
- B. contamination or mutation can have a disastrous effect on the operation
- C. the government will not approve the licensing of pharmaceuticals produced in continuous cultures
- D. all of the above Discuss
- 2. Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?
Options- A. NAD+ is diverted away from homeostasis to anabolism
- B. ATP is diverted away from homeostasis to anabolism
- C. NAD+ is diverted away from anabolism to homeostasis
- D. ATP is diverted away from anabolism to homeostasis Discuss
- 3. Mixing profiles closest to plug flow are observed in
Options- A. continuous packed bed reactor
- B. stirred tank reactor with biomass recycles
- C. continuous fluidized bed bioreactor
- D. all of these Discuss
- 4. For organisms growing in a chemostat, the specific growth rate
Options- A. cannot be determined
- B. can be determined from the dilution rate
- C. equals to the maximum specific growth rate of the culture
- D. none of the above Discuss
- 5. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol
Options- A. becomes a secondary metabolite
- B. production becomes growth associated
- C. production becomes non-growth associated
- D. becomes a growth nutrient Discuss
- 6. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
Options- A. will increase until the culture washes out
- B. will decrease after washout
- C. will be zero
- D. will be infinite Discuss
- 7. Mixing per unit volume is observed to be poorest in
Options- A. continuous packed bed reactor
- B. continuous fluidized bed bioreactor
- C. continuous airlift bioreactor
- D. none of the above Discuss
- 8. A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be
Options- A. ln(2)/0.5
- B. ln(2) x 0.5
- C. 0.5 h
- D. 2 h Discuss
- 9. 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
- 10. Yield coefficient represents
Options- A. total biomass or product produced
- B. conversion efficiency of a substrate into product
- C. conversion rate of a substrate into biomass or product
- D. production time of biomass or product Discuss
Fermentation Reactors problems
Search Results
Correct Answer: all of the above
Correct Answer: ATP is diverted away from anabolism to homeostasis
Correct Answer: continuous packed bed reactor
Correct Answer: can be determined from the dilution rate
Correct Answer: production becomes non-growth associated
Correct Answer: will be zero
Correct Answer: continuous packed bed reactor
Correct Answer: 2 h
Correct Answer: cells will redirect ATP to the active transport of lactic acid and H+ out of the cells
Correct Answer: conversion efficiency of a substrate into product
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