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Unformatted text preview: avoiding the water. The polar phosphate groups are oriented toward the water. Membranes that surround cells and surround many of the structures within cells are primarily phospholipid bilayers . Steroids Steroids have a backbone of 4 carbon rings. Cholesterol (see diagram above) is the precursor of several other steroids, including several hormones . It is also an important component of cell membranes. Saturated fats and cholesterol in the diet can lead to deposits of fatty materials on the linings of the blood vessels. Waxes Waxes are composed of a long-chain fatty acid bonded to a long-chain alcohol They form protective coverings for plants and animals (plant surface, animal ears)....
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- Fall '10