12th Biology Science Session 2022-23
12th Biology Terminal Exam Based Extra Questions
12th Biology NCERT Syllabus Questions
Class 12th Biology Sample paper Questions
How was penicillin discovered?
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Penicillin was an accidental discovery. Sir Alexander Fleming observed that in unwashed culture plates of Staphylococcus, a mould Penicillium was growing This mould inhibited the growth of Staphylococcus . Latre the antibitic Penicillin was isolated from this fungus.