The Phospholipid molecule - rotatable in 3 dimensions

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Phospholipids consist of a glycerol unit joined to 2 fatty acid residues and a phosphate group, in this case attached to choline.

The phosphate group can ionise, so it is described as the hydrophilic end of the molecule, whereas the fatty acid chains are hydrophobic.

This explains the orientation of the phospholipid molecules in the bilayer which makes up the cell or plasma membrane.



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