A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2025Paper 2 Q54 Marks
Inhibitors are substances that prevent biological processes in a variety of different ways. Table 5.1 shows some antibiotics, their modes of action and the diseases which they are used to treat. Table 5.1 antibiotic | mode of action | disease --- | --- | --- erythromycin | binds to ribosomes to inhibit translation | cholera penicillin | enzyme inhibitor | tetanus rifampicin | inhibits the function of RNA polymerase in transcription | tuberculosis
📋 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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