A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2021 · 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?
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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
D: increases permeability of hydrophobic region: Z repels polar molecules: Y and Z attracts water molecules: X
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