industrially-useful-microbial-processes microbiology question and answers -Page 3

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Industrially Useful Microbial Processes problems

1. 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

Discuss

Correct Answer: 24 mm diameter zone using the cylinder plate method of assay

2. 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

Correct Answer: Ashbya gossypii

3. 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

Correct Answer: racemase

4. 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

Correct Answer: CaCO₃

5. 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

Correct Answer: P. denitrificans

6. Which species from the followings is resistant to methyl tryptophan?
Options
A. Candida utilis
B. E. coli
C. B. subtilis
D. Hansenula anomala

Discuss

Correct Answer: B. subtilis

7. Which of the following was the first amino acid to be produced commercially?
Options
A. L-glutamic acid
B. L-lysine
C. L-cystine
D. L-methionine

Discuss

Correct Answer: L-lysine

8. The commonly used media for submerged bacterial fermentation at commercial scale is
Options
A. beet molasses
B. liver extract
C. germinated seed
D. none of these

Discuss

Correct Answer: beet molasses

9. Rickes et al. recovered active crystalline vitamin B₁₂ from the culture of
Options
A. Streptomyces griseus
B. Bacillus megaterium
C. Streptomyces olivaceus
D. Streptomyces lactis

Discuss

Correct Answer: Streptomyces griseus

10. Protease, which is used for flavouring of sake and haze removal in sake is produced by
Options
A. A. oryzae
B. A. flavus
C. B. cereus
D. A. niger

Discuss

Correct Answer: A. oryzae

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