A-LevelBiologyInfectious diseasesOct/Nov 2018Paper 1 Q371 Mark
The antibiotic tetracycline binds to the small subunit of bacterial ribosomes, stopping protein synthesis. Bacteria have become resistant to tetracycline due to the effect of mutations. Which effect could produce resistance to tetracycline?
Apreventing tetracycline from binding to the bacterial cell wall
Bpreventing tetracycline from entering the bacterial cell
Cpreventing tetracycline from inhibiting transcription
Dpreventing the production of tetracycline by ribosomes
✓ Correct Answer
The correct answer is B: preventing tetracycline from entering the bacterial cell
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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