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Home Biotechnology Vinegar and Citric Acid Comments

  • Question
  • Which of the following microorganism is used for the production of citric acid?


  • Options
  • A. Lactobacillus bulgaricus
  • B. Saccharomyces cerevisiae
  • C. Aspergillus niger
  • D. Streptococcus lactis

  • Correct Answer
  • Aspergillus niger 


  • Vinegar and Citric Acid problems


    Search Results


    • 1. In liquid surface culture process for the fermentation to produce citric acid,

    • Options
    • A. A. niger is used with solid substrate as sweet potato
    • B. A. niger floats on the surface of solution
    • C. Fungal mycelium grows through out the solution in a deep tank
    • D. both (a) and (b)
    • Discuss
    • 2. Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

    • Options
    • A. Ammonium salt
    • B. Urea
    • C. Both (a) and (b)
    • D. Peptone
    • Discuss
    • 3. What is the pH of the medium when molasses is used as substrate for the production of citric acid?

    • Options
    • A. 3
    • B. 4
    • C. 5
    • D. 6
    • Discuss
    • 4. Which substrate is used in the fermentation of citric acid?

    • Options
    • A. Beet molasses
    • B. Sucrose
    • C. Starch hydrolysate
    • D. All of these
    • Discuss
    • 5. During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

    • Options
    • A. HCl
    • B. HNO3
    • C. H2SO4
    • D. None of these
    • Discuss
    • 6. Vinegar is typically produced in fed batch reactors because

    • Options
    • A. a fed batch reactor can be used to maintain low acetic acid concentrations
    • B. a fed batch reactor can be used to maintain low ethanol concentrations
    • C. acetic acid bacteria tend to ferment at high ethanol concentrations
    • D. all of the above
    • Discuss
    • 7. Malt vinegar is produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 8. Alegar is a type of vinegar produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 9. Sugar content of the fermentation medium for citric acid is maintained at

    • Options
    • A. 10-15%
    • B. 15-20%
    • C. 20-25 %
    • D. 25-30 %
    • Discuss
    • 10. Cider vinegar is produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss


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