The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered

Question

The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered to be an
example of artificial selection because
A) S. aureus is cultivated by humans to replenish the soil with nutrients.
B) Humans are becoming resistant to bacteria by taking methicillin.
C) humans purposefully raise MRSA in large fermenters in an attempt to make the bacteria
ever-more resistant.
D) humans synthesize methicillin and create environments in which bacteria frequently come
into contact with methicillin.

Explanation / Answer

D) humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin. Remember that humans are not becoming resistant to bacteria (B is therefore incorrect) but that bacteria is becoming resistant to methicillin.

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