| Front | Explain how three features of a plasma membrane adapt it for its functions ( 6 marks) |
|---|---|
| Back | phospholipid bilayer (as a barrier) forms a barrier to water soluble / charged substances / allows non-polar substances to pass OR maintains a different environment on each side / compartmentalisation bilayer is fluid can bend to take up different shapes for phagocytosis / form vesicles / self repair; channel proteins (through the bilayer)/intrinsic protein; let water soluble/charged substances through / facilitated diffusion; carrier proteins (through the bilayer) allow facilitated diffusion / active transport surface proteins / extrinsic proteins, glycoproteins / glycolipids cell recognition / act as antigens / receptors cholesterol; regulates fluidity / increases stability; |
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