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

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

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Industrially Useful Microbial Processes
Which of the following are true for the heterofermentative microorganism producing lactic acid?

They are used for commercial lactic acid production
None of these
Only trace amounts of end products other than lactic acid
Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products

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