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1) phosholipds

2) proteins (integral or surface)

3) cholesterol

4) carbonhydrates attach on the lipid or the protein

Cell membranes are made of a phospholipid bilayer, which is basically two lipids with a hydrophobic tail facing each other and a hydrophilic head surrounding the outsides. Proteins are embedded within the phospholipid bilayer and serve many purposes such as active transport.

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