Q.“Antibiotics are known as microbe’s growth inhibiting drugs.” Give one example with its source.

An antibiotic is a chemical substance produced by one microorganism that inhibits the growth of, or kills, another -- an outcome of natural microbial competition for resources that humans have learned to exploit as medicine. The first antibiotic, penicillin, was discovered by Alexander Fleming in 1928 when he observed that the mould Penicillium notatum, accidentally contaminating a bacterial culture plate, created a clear zone in which bacterial growth was inhibited. Fleming could not purify or mass-produce the compound himself; that achievement came later, during the Second World War, through the work of Ernst Chain and Howard Florey, for which all three scientists shared the 1945 Nobel Prize. Antibiotics are manufactured commercially today using the same industrial fermenta …