Question

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Answer 1

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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.

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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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