A-LevelBiologyCell membranes and transportFeb/Mar 2021Paper 1 Q111 Mark
The diagram shows a phospholipid molecule divided into three regions, X, Y and Z. R, in region X, represents a range of possible chemical groups. [Diagram of phospholipid molecule with regions X, Y, Z labeled] Regions X, Y and Z affect the properties of cell surface membranes in different ways. Which row shows the effect of each region on the properties of a cell surface membrane?
Aincreases permeability of hydrophobic region: X
repels polar molecules: X
attracts water molecules: Y and Z
Bincreases permeability of hydrophobic region: Y
repels polar molecules: Y and Z
attracts water molecules: X
Cincreases permeability of hydrophobic region: Y and Z
repels polar molecules: X
attracts water molecules: Y and Z
Dincreases permeability of hydrophobic region: Z
repels polar molecules: Y and Z
attracts water molecules: X
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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