Phospholipids - avoiding the water. The polar phosphate...

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Phospholipids Phospholipids have a structure like a triglyceride (see diagram above), but contain a phosphate group in place of the third fatty acid. The phosphate group is polar and therefore capable of interacting with water molecules. Phospholipids spontaneously form a bilayer in a watery environment. They arrange themselves so that the polar heads are oriented toward the water and the fatty acid tails are oriented toward the inside of the bilayer (see the diagram below). In general, nonpolar molecules do not interact with polar molecules. This can be seen when oil (nonpolar) is mixed with water (polar). Polar molecules interact with other polar molecules and ions. For example table salt (ionic) dissolves in water (polar). The bilayer arrangement shown below enables the nonpolar fatty acid tails to remain together,
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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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Phospholipids - avoiding the water. The polar phosphate...

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