A level Biology exam revision resources written by A level Examiners


Phospholipids have a similar structure to triglycerides, but instead of having three fatty acids attached to the glycerol they have two fatty acids and one phosphate group. Phospholipids have a polar hydrophilic "head" (the phosphate group) and two non-polar hydrophobic "tails" (the fatty acid chains).

Biochemistry fig25

This polarity is what helps phospholipids form stable bilayers in aqueous solutions and these bilayers form the basis of plasma membranes.


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