________________, in 1928, first discovered penicillin antibiotic.
The first antibiotic called penicillin was extracted from :
(a) a bacterium (b) a protozoan (c) a fungus (d) an alga
A particular species of which one of the following, is the source bacterium of the antibiotic, discovered next to penicillin, for the treatment of tuberculosis ?
(a) Escherichia (b) Streptomyces (c) Rhizobium (d) Nitrobacter
The antibiotic penicillin was discovered by: