Discussion
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
- 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
Vinegar and Citric Acid problems
Search Results
Correct Answer: A. niger floats on the surface of solution
Correct Answer: Both (a) and (b)
Correct Answer: 5
Correct Answer: All of these
Correct Answer: H2SO4
Correct Answer: a fed batch reactor can be used to maintain low ethanol concentrations
Correct Answer: malted grain
Correct Answer: ale
Correct Answer: 20-25 %
Correct Answer: fruit juices
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