Exercise: Ethanol Production

Questions for: Ethanol Production

High ethanol concentration
A:
promotes yeast growth
B:
inhibits yeast growth
C:
promotes bacterial growth
D:
inhibits bacterial growth
Answer: B
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To maintain aseptic conditions during fermentation which of the following is needed?
A:
Sterilization of fermentor
B:
Sterilization of air supply
C:
Aeration and agitation
D:
All of these
Answer: D
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Which of the following is used for agitation in a fermentor?
A:
Impeller
B:
Baffles
C:
Sparger
D:
All of these
Answer: A
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What are the fermentation conditions for the ethanol production?
A:
pH 6; temperature 35°C
B:
pH 5; temperature 35°C
C:
pH 6; temperature 30°C
D:
pH 5; temperature 30°C
Answer: B
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How is air supply to the fermentor sterilized?
A:
By heat filtration
B:
Filtration through fibrous material
C:
Filtration through granular material
D:
All of the above
Answer: D
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