Exercise: Fermentation Reactors

Questions for: Fermentation Reactors

Which of the following would not be subjected to the "glucose effect"?
A:
Aspergillus fumigatus
B:
Saccharomyces cerevisiae
C:
Escherichia coli
D:
Aspergillus niger
Answer: C
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Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because
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
Answer: D
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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
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
Answer: A
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Mixing in an anaerobic sludge blanket reactor is due to
A:
rapid change in water temperatures throughout the reactor
B:
release of gases by the microbial populations
C:
swimming of microbes
D:
none of the above
Answer: B
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The lowest yield of ATP /is in
A:
fermentation
B:
aerobic respiration
C:
anaerobic respiration
D:
same in (a), (b) and (c)
Answer: A
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