A-LevelBiologyCell structureOct/Nov 2016Paper 1 Q11 Mark
Until recently, the typical viruses known to science were 20 – 150 nm in size. In 2003, the Mimivirus was discovered with a size of approximately 680 nm. In 2013, the Pandoravirus was discovered which has a size of over 1000 nm. Which viruses can be seen using both a light microscope with a maximum resolution of 0.25 μm and an electron microscope? key ✓ = can be seen, x = cannot be seen
Atypical virus ✓, Mimivirus ✓, Pandoravirus ✓
Btypical virus X, Mimivirus ✓, Pandoravirus ✓
Ctypical virus X, Mimivirus X, Pandoravirus ✓
Dtypical virus X, Mimivirus X, Pandoravirus X
✓ Correct Answer
The correct answer is B: typical virus X, Mimivirus ✓, Pandoravirus ✓
📋 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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