A-LevelBiologySelection and evolutionFeb/Mar 2018Paper 1 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
The correct answer is C. This question tests the candidate's understanding of selection and evolution within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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