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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 fluid portion of the cell membrane is made of phospholipids. a. A phospholipid molecule is composed of a hydrophilic head and two hydrophobic tails.b.he fluid portion of the cell membrane is made of phospholipids. a. A phospholipid molecule is composed of a hydrophilic head and two hydrophobic tails. b.