A-LevelBiologyCell membranes and transportMay/June 2020Paper 1 Q171 Mark

When a small quantity of phospholipid is added to a test-tube of water and then shaken vigorously, an emulsion is formed by small droplets called liposomes. Which diagram shows the arrangement of phospholipid molecules in a cross-section of a liposome? [Figure 17.1]

Q: What topic does this question test?

This question tests Cell membranes and transport in A-Level Biology (syllabus code 9700). It is worth 1 mark.

APhospholipids arranged in a micelle, hydrophilic heads outside.

BPhospholipids arranged in an inverted micelle, hydrophobic tails outside.

CPhospholipids arranged in a bilayer forming a sphere (liposome).

DPhospholipids arranged with hydrophobic tails pointing outwards from a central core.

✓ Correct Answer

The correct answer is C: Phospholipids arranged in a bilayer forming a sphere (liposome).

📋 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 Cell membranes and transport in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2020 examination, Paper 1 Variant 2.

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