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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 electron microscopic studies reveal that the cell membranes are 75-100 Ao (7.5-10.0 nm) in thickness. The cell membranes are primarily composed of lipids (about 40%) & proteins (about 60%). Also have carbohydrates (1-10%)- present as glycolipids and glycoproteins. A cell membrane consists of 3 layers; a lipid bilayer coated on either side with a layer of protein.