Unformatted text preview: cell walls. Cotton fabric and paper are commercial cellulose products. Lipids Lipids are organic molecules composed of carbon, hydrogen, and oxygen atoms. The ratio of hydrogen atoms to oxygen atoms is much higher in lipids than in carbohydrates. Lipids include steroids (the material of which many hormones are composed), waxes, and fats. Fat molecules are composed of a glycerol molecule and one, two, or three molecules of fatty acids (see Figure 2 ). A glycerol molecule contains three hydroxyl (—OH) groups. A fatty acid is a long chain of carbon atoms (from 4 to 24) with a carboxyl (—COOH) group at one end. The fatty acids in a fat may be all alike or they may all be different. They are bound to the glycerol molecule by a process that involves the removal of water....
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.
- Fall '07