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The cell membrane is composed of the lipid bilayer. In addition to lipids most membranes contain proteins and carbohydrates. ________________________________________________________________. YOUR finger nails and hair are made out of Keratin. its a protein (so is whale baleen and animal horns)
Confidence votes 855. Cell membranes are primarily composed of a phospholipid bilayer. Amongst these layers there are proteins embedded both on the inner and outer surfaces and through the layer often acting as channels for other substances.