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.

Biochemistry




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