Which of the following statements explains how strains of methicillin-resistant Staphylococcus aureus appeared two years after doctors began using the antibiotic methicillin?
- The drug-resistant bacteria existed in the population but did not have an advantage until the environment changed with the introduction of methicillin.
- In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
- The bacteria that survived the drug methicillin, developed an immunity to the drug.
- The bacteria mutated in response to the drug and began making drug-resistant versions of proteins need to build cell walls.
In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
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