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16. What are the fermentation conditions for 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

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17. Which of the following is used for agitation in a fermentor?

A. Impeller
B. Baffles
C. Sparger
D. All of these

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18. 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

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19. High ethanol concentration

A. promotes yeast growth
B. inhibits yeast growth
C. promotes bacterial growth
D. inhibits bacterial growth

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