The enzyme which converts optically active isomers of lactic acid to the optical

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Question
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

Correct Answer

racemase

Industrially Useful Microbial Processes problems

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1. 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

2. 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

3. 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

4. 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%

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

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The enzyme which converts optically active isomers of lactic acid to the optically inactive racemic mixture is

Industrially Useful Microbial Processes problems

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