Industrially Useful Microbial Processes
The biotin level in obtaining L-gluatmic acid by fermentation using Micrococcus glutamicus is critical because

both (a) and (b)
None of these
too low level prevents growths, hence L-glutamic acid production
too high level prevents L-glutamic acid production

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Industrially Useful Microbial Processes
The early assay employed for measuring penicillin activity were based upon the quantity required to prevent growth of S. aureus over

200 mm diameter zone using the cylinder plate method of assay
20 mm diameter zone using the cylinder plate method of assay
None of these
24 mm diameter zone using the cylinder plate method of assay

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