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GCSE Biology Paper 1 (9-1 Exams)

Bacteria Petri Dishes Mould Penicillin Discovered Alexander Fleming

Alexander Fleming discovered penicillin after observing that mold on a Petri dish inhibited bacterial growth.

Alexander Fleming discovered penicillin when he noticed mold on a bacteria-filled Petri dish killing the bacteria around it.

Front How was penicillin discovered?
Back
  • Alexander Fleming was clearing out Petri dishes with bacteria
  • He noticed one of the dishes had mould on it and the area around it was free of bacteria
  • The mould on the Petri dish was producing a subatance that killed bacteria - penicillin.

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