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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 lipid bilayer of a cell membrane is composed of two layers of phospholipids with polar heads on the outside and nonpolar tails facing inward. It also contains embedded proteins and considerable amounts of cholesterol to maintain membrane fluidity. lipid bilayer is a double layer membrane formed from phospholipids. Phospholipids are composed of a polar head group and non-polar fatty acid tails. The arrangement of the p â¦ hospholipids makes the cell membrane permeable. 4 people found this useful.