A-LevelBiologyInfectious diseasesOct/Nov 2018Paper 1 Q401 Mark

Why has it proved difficult to develop an effective vaccine against malaria?

Q: What topic does this question test?

This question tests Infectious diseases in A-Level Biology (syllabus code 9700). It is worth 1 mark.

AMosquitoes have many stages in their life cycles.

BThe human immune system does not recognise the antigens of the parasite.

CThe parasites can only be attacked when outside the liver cells and red blood cells.

DVaccines are rapidly broken down by proteases in the stomach.

✓ Correct Answer

The correct answer is C: The parasites can only be attacked when outside the liver cells and red blood cells.

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Infectious diseases in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2018 examination, Paper 1 Variant 2.

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