Biology 9700 · AS & A Level · Fluid mosaic membranes

Fluid mosaic membranes — practice question

The diagram presents a phospholipid molecule split into three sections, X, Y and Z. R, in section X, stands for a variety of possible chemical groups. The three sections X, Y and Z influence the properties of cell surface membranes in different ways. Which row identifies the effect of each section 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

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