Exercise: Fermentation Reactors
Questions for: Fermentation Reactors
When Escherichia coli grow in a well aerated medium, which of the following will occur?
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
Answer: B
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In the batch-fed mode, substrate will be added
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
Answer: C
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Continuous culture has an advantage over to a batch cultures as
A:
continuous reactors do not need to be shut down and cleaned as regularly as a batch reactor
B:
most downstream and upstream processes are continuous in nature and thus the operation of continuous bioreactor can be better integrated into the overall manufacturing process
C:
cells can be maintained at a constant physiological state simply by setting the dilution rate
D:
all of the above
Answer: D
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Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
A:
High concentration of dissolved oxygen
B:
Low concentration of dissolved oxygen
C:
No effect of dissolved oxygen
D:
High concentration of dissolved oxygen and sodium salts
Answer: C
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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
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
Answer: B
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