16. The biotin level in obtaining L-glutamic acid by fermentation using Micrococcus glutamicus is critical because

A. too low level prevents growths, hence L-glutamic acid production
B. too high level prevents L-glutamic acid production
C. both (a) and (b)
D. none of the above

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17. Most productive species among the different vitamin B₁₂ producing Pseudomonads is

A. P. denitrificans
B. P. ovalis
C. P. aureofaciens
D. none of these

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

A. isomerase
B. racemase
C. dehydrogenase
D. invertase

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19. The sugar concentration of molasses used in fermentation should be

A. 10-18%
B. 20-30%
C. 4-5%
D. 30-38%

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20. Bacitracin, an antibiotic similar to penicillin, is produced by

A. Bacillus polymyxa
B. Streptomyces erythreus
C. Bacillus licheniformis
D. Aspergillus fumigatus

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