Alexander Fleming was a biologist who was best known for his discovery of the antibiotic penicillin. During his research, Dr. Fleming noticed that there was no bacterial growth where there was mold growing on his petri dishes. He could have thrown out his plates, but instead he cultured the mold.
How did Dr. Fleming’s creativity lead to a scientific discovery?

He noticed that bacteria cells and mold coexisted well.

He observed that bacterial cells had become mold.

He concluded that the mold inhibited the growth of bacteria. He inferred that mold and bacteria share most of their DNA.

In 1928, at St. Mary's Hospital, London, Alexander Fleming discovered penicillin. This discovery led to the introduction of antibiotics that greatly reduced the number of deaths from infection.

How was Alexander Fleming's discovery made?

An uncovered Petri dish near an open window became contaminated with mold. Fleming realized that the bacteria near the mold were dying. He isolated the mold and identified it as Penicillium genus, which he found to be effective against all Gram-positive pathogens.

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