NEET BIOLOGY

Detailed explanation-1: -Alexander Fleming was a Scottish physician-scientist who was recognised for discovering penicillin.

Detailed explanation-2: -Alexander Fleming’s Discovery After isolating the mold and identifying it as belonging to the Penicillium genus, Fleming obtained an extract from the mold, naming its active agent penicillin. He determined that penicillin had an antibacterial effect on staphylococci and other gram-positive pathogens.

Detailed explanation-3: -1928 to 1929. In 1928 Dr Alexander Fleming returned from a holiday to find mould growing on a Petri dish of Staphylococcus bacteria. He noticed the mould seemed to be preventing the bacteria around it from growing. He soon identified that the mould produced a self-defence chemical that could kill bacteria.

Detailed explanation-4: -A more conventional account would credit the discovery of penicillin ("mould juice") to Sir Alexander Fleming and his untidy lab work. Interestingly enough, Pasteur’s passing and Fleming’s accidental discovery occurred on the same date-September 28th; two events separated by exactly 33 years.