Alexander Fleming observed a colony of mold that inhibited the growth of nearby bacteria. What was the hypothesis proposed by Fleming to explain this result?
A) The bacteria changed their DNA when growing near the mold.
B) The mold used all of the nutrients so that the bacteria couldnʹt grow.
C) The mold produced a substance that killed nearby bacteria.
D) The mold was dead.

Question

Quizplus · Accepted Answer

Fleming hypothesized that the mold produced a substance that killed nearby bacteria, leading to the discovery of penicillin, the first true antibiotic.

Alexander Fleming Observed a Colony of Mold That Inhibited the Growth