Which acid is produced by the bacterium $Acetobacter$ $aceti$?

Select the correct match:

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

Alexander Fleming discovered penicillin in $1928$ during his work with which of the following?

Beer and buttermilk are products of fermentation by

Match the Column-$I$ and Column-$II$ by suitable manner.

Column-$I$	Column-$II$
$1$. Pectinase	$(A)$ Removing clots from the blood vessels of patients
$2$. Statins	$(B)$ Clarified fruit juices packed in bottles
$3$. Cyclosporin-$A$	$(C)$ Immunosuppressive agent in organ transplant
$4$. Streptokinase	$(D)$ Blood cholesterol lowering agent