- Phospholipids are the same as lipids apart from that one fatty acid is replaced by a phosphate molecule
- Fatty acid molecules repel water, phosphate molecules attract water
Hydrophilic head: phosphate end which interacts with water
Hydrophobic tail: fatty acid end which moves itself away from water
- Phospholipids form the bilayer
- The inner layers hydrophilic heads point inwards to the cytoplasm
- The outer layers hydrophilic heads point inwards to the water surrounding the cell
- The hydrophobic tails point to the centre of the membrane
Phospholipids make the membrane flexible, allow lipid soluble substances to enter and leave the cell and prevent water soluble substances from entering or leaving the cell.
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