$S$ (Assertion): Alexander Fleming established the full potential of penicillin as an effective antibiotic.
$R$ (Reason): Alexander Fleming discovered penicillin.

Penicillium notatum stops the growth of

$A$ scientist associated with the discovery of the first 'antibiotic' is

Select the appropriate option for $Saccharomyces \ cerevisiae$.

The chemotherapeutic importance of penicillin was given by .....

Medicines are either man-made (i.e.,synthetic) or obtained from living organisms like plants,bacteria,animals,etc.,and hence,the latter are called natural products. Sometimes,natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical: $(a)$ Penicillin $(b)$ Sulphonamide $(c)$ Vitamin-$C$ $(d)$ Growth hormone.