medium · MCAT bio-biochem
A bacterial population develops resistance to an antibiotic after a few weeks of exposure.
Which of the following best describes the evolutionary mechanism responsible for this change?
- Individual bacteria learned to adapt to the drug by altering their cell wall structure.
- The bacteria underwent gene flow with a nearby eukaryotic population to acquire resistance.
- The antibiotic induced mutations in the bacteria that allowed them to survive.
- The antibiotic acted as a selective pressure, allowing pre-existing resistant variants to survive and reproduce.
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