Free SAT Diagnostic Test
Question 1 of 30Reading & Writing
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Reading Comprehension
The discovery of penicillin in 1928 by Alexander Fleming transformed modern medicine. Fleming noticed that a mold, Penicillium notatum, had contaminated one of his petri dishes and was killing the surrounding bacteria. Rather than discarding the dish, he investigated further, ultimately leading to the development of the first true antibiotic.
According to the passage, what was significant about Fleming's reaction to the contaminated dish?