Which bacteria was being cultured by the discoverer of the first antibiotic at the time of its discovery?

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.

The nutritive medium for growing bacteria and many fungi in the laboratory is called

Male mosquitoes feed on which of the following?

Which of the following statements is false regarding microorganisms?

Yeast is an important source of