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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)
The cell membrane is made of two layers of phospholipids and each phospholipid molecule has a head and a pair of tails. The head region is hydrophilic (attraction towards water molecules) and the tail ends are hydrophobic (stays away from water molecules).