A-LevelBiologyCell membranes and transport9700/12 · May/June 2020 · 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]
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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
C: Phospholipids arranged in a bilayer forming a sphere (liposome).
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