2.7 Lipids 35


Polar head group

Phosphate group


CH2 I 2 CH2

Phosphate group

Saturated fatty acid

Figure 2.29 Phospholipid and the Bilayer that Phospholipids Form in the Membrane of Cells In phospholipids, two of the —OH groups of glycerol are linked to fatty acids and the third —OH group is linked to a hydrophilic head group, which contains a phosphate ion and a polar molecule, labeled R.

Unsaturated fatty acid

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