A-LevelBiologySelection and evolution9700/12 · Feb/Mar 2018 · Q371 Mark
Bacteria that infect skin wounds can become resistant to the antibiotic commonly used to kill them. Which statement explains how these bacteria could become resistant to the antibiotic?
AExposure to the antibiotic causes a change in the bacterial cell wall, preventing the antibiotic from working.
BOther bacteria that normally protect the skin against infection are killed by the antibiotic, allowing the infectious bacteria to survive.
CRandom mutations in DNA allow some of the bacteria to survive in the presence of the antibiotic.
DThe antibiotic causes the bacterial DNA to mutate, allowing the bacteria to survive in the presence of the antibiotic.
✓ Correct answer
C: Random mutations in DNA allow some of the bacteria to survive in the presence of the antibiotic.
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