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Vinegar and Citric Acid

Vinegar and Citric Acid
What is the pH of the medium when sucrose is used as substrate for the production of citric acid?

3
6
5
4

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Vinegar and Citric Acid
Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Urea
Ammonium salt
Both (a) and (b)
Peptone

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Vinegar and Citric Acid
Malt vinegar is produced from

malted grain
ethanol
ale
fruit juices

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Vinegar and Citric Acid
Ethanol is oxidized to acetic acid aerobically using

Acetobacter
Lactobacillus
Gluconobacter
both (a) and (b)

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Vinegar and Citric Acid
Vinegar production consists of

anaerobic fermentation
aerobic fermentation followed by anaerobic fermentation
anaerobic fermentation followed by aerobic fermentation
aerobic fermentation

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Vinegar and Citric Acid
In liquid surface culture process for the fermentation to produce citric acid,

Fungal mycelium grows through out the solution in a deep tank
A. niger floats on the surface of solution
A. niger is used with solid substrate as sweet potato
both (a) and (b)

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