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- Question
The early assay employed for measuring penicillin activity were based upon the quantity required to prevent growth of S. aureus over
Options- A. 20 mm diameter zone using the cylinder plate method of assay
- B. 24 mm diameter zone using the cylinder plate method of assay
- C. 200 mm diameter zone using the cylinder plate method of assay
- D. None of the above
- Correct Answer
- 24 mm diameter zone using the cylinder plate method of assay
- 1. Which of the following is a heterofermentative micro-organism?
Options- A. Leuconostoc mesenteroides
- B. Lactobacillus delbrueckii
- C. Lactobacillus bulgaricus
- D. Lactobacillus pentose Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Which of the following is known for greater stability of the riboflavin producing capacity?
Options- A. Eremothecium ashbyii
- B. Ashbya gossypii
- C. Candida flareri
- D. None of these Discuss
- 7. The enzyme which converts optically active isomers of lactic acid to the optically inactive racemic mixture is
Options- A. isomerase
- B. racemase
- C. dehydrogenase
- D. invertase Discuss
- 8. Which of the following substance is employed to neutralize the lactic acid as it is produced (because lactic acid bacteria do not tolerate high concentrations of acid?
Options- A. CaCO3
- B. (NH4)2 HPO4
- C. MgSO4
- D. Na2SO4 Discuss
- 9. Most productive species among the different vitamin B12 producing Pseudomonads is
Options- A. P. denitrificans
- B. P. ovalis
- C. P. aureofaciens
- D. none of these Discuss
- 10. Which species from the followings is resistant to methyl tryptophan?
Options- A. Candida utilis
- B. E. coli
- C. B. subtilis
- D. Hansenula anomala Discuss
Industrially Useful Microbial Processes problems
Search Results
Correct Answer: Lactobacillus delbrueckii
Correct Answer: 95%
Correct Answer: All of the above
Correct Answer: Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products
Correct Answer: Co
Correct Answer: Ashbya gossypii
Correct Answer: racemase
Correct Answer: CaCO3
Correct Answer: P. denitrificans
Correct Answer: B. subtilis
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