In the cheese industry,rennin is used as a/an .......

Identify the mis-matched pair from the following list of microorganisms and their commercial products.

The concentration of alcohol in a sugar solution inoculated with yeast,after which the yeast cells are killed,is: (in $\%$)

Select the incorrect statement.

Which of the following scientists established penicillin as an effective antibiotic?
$(i)$ Ernst Chain
$(ii)$ Alexander Fleming
$(iii)$ Howard Florey
$(iv)$ Waksman

Which microorganism is used for the commercial production of citric acid?