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Home Biotechnology Vinegar and Citric Acid Comments

  • Question
  • What is the pH of the medium when sucrose is used as substrate for the production of citric acid?


  • Options
  • A. 3
  • B. 4
  • C. 5
  • D. 6

  • Correct Answer



  • Vinegar and Citric Acid problems


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    • 1. Cider vinegar is produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 2. 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
    • 3. Alegar is a type of vinegar produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 4. Malt vinegar is produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 5. 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
    • 6. In submerged 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
    • 7. The mitochondria of a eukaryotic cell is the site of

    • Options
    • A. photosynthesis
    • B. fatty acid metabolism
    • C. cellular respiration
    • D. protein synthesis
    • Discuss
    • 8. The cell theory states:

    • Options
    • A. Cells form as organelles and molecules become grouped together in an organized manner.
    • B. The normal functioning of an organism does not depend on its individual cells.
    • C. The cell is the basic unit of life.
    • D. Only eukaryotic organisms are made of cells.
    • Discuss
    • 9. As the size of a cell decreases, the ratio of its surface area to volume:

    • Options
    • A. increases
    • B. decreases
    • C. stays the same
    • D. None of these
    • Discuss
    • 10. Which of the following would not be found in a prokaryotic cell?

    • Options
    • A. organelles
    • B. DNA
    • C. nucleoid
    • D. nucleus
    • Discuss


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