Industrially Useful Microbial Processes problems
- 1. Which of the following is not an industrial product made by the fungus Aspergillus niger?
Options- A. Galactosidase
- B. Citric acid
- C. Gluconic acid
- D. Lysine Discuss
Correct Answer: Lysine
- 2. Alcohol production from starch and raw sugar utilizes selected strains of
Options- A. Saccharomyces cerevisiae
- B. Candida pseudotropicalis
- C. Candida utilis
- D. none of these Discuss
Correct Answer: Saccharomyces cerevisiae
- 3. A major organic acid produced by a microbial process used in foods is
Options- A. sulfuric acid
- B. citric acid
- C. oxalic acid
- D. uric acid Discuss
Correct Answer: citric acid
- 4. Penicillin G is also known as
Options- A. hydroxy benzyl penicillin
- B. phenoxy methyl penicillin
- C. benzyl penicillin
- D. 2-pentenyl penicillin Discuss
Correct Answer: benzyl penicillin
- 5. Why high concentration of sugars are not employed in the fermentation medium?
Options- A. Calcium lactate is not produced
- B. Calcium lactate crystallizes from the medium and slows down the process of fermentation
- C. High sugar concentration itself crystallizes
- D. None of the above Discuss
Correct Answer: Calcium lactate crystallizes from the medium and slows down the process of fermentation
- 6. Which of the following when used in proper concentration stimulates the Ascomycetes fermentation of vitamin B12 and can be used to counteract toxicity of iron in Candida species?
Options- A. Co
- B. Ni
- C. Zn
- D. Ca Discuss
Correct Answer: Co
- 7. Which of the following are true for the heterofermentative microorganism producing lactic acid?
Options- A. Only trace amounts of end products other than lactic acid
- B. Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products
- C. They are used for commercial lactic acid production
- D. None of the above Discuss
Correct Answer: Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products
- 8. B. flavum strain can be used for the production of
Options- A. L-Threonine
- B. L-Proline
- C. L-Isoleucine and L-Histidine
- D. All of the above Discuss
Correct Answer: All of the above
- 9. The maximum concentration of ethanol that is achieved by successive distillation of fermentation broth in continuous stills is
Options- A. 60%
- B. 95%
- C. 70%
- D. 99% Discuss
Correct Answer: 95%
- 10. Which of the following is a heterofermentative micro-organism?
Options- A. Leuconostoc mesenteroides
- B. Lactobacillus delbrueckii
- C. Lactobacillus bulgaricus
- D. Lactobacillus pentose Discuss
Correct Answer: Lactobacillus delbrueckii
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