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Question

(A) The discovery of penicillin by Alexander Fleming in $1928$ was based on the observation that the mold $Penicillium$ $notatum$ inhibited the growth

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Biological antagonism

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(A) The discovery of penicillin by Alexander Fleming in $1928$ was based on the observation that the mold $Penicillium$ $notatum$ inhibited the growth of $Staphylococcus$ bacteria in a culture plate. This interaction,where one organism produces substances that inhibit or kill another,is known as biological antagonism or antibiosis.

The phenomenon that led to the discovery of penicillin involves:

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