Complex carbohydrates are known as polysaccharides

Complex carbohydrates are known as polysaccharides - cell...

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Complex carbohydrates are known as  polysaccharides . Polysaccharides are formed by linking  innumerable monosaccharides. Among the most important polysaccharides are the starches, which  are composed of hundreds or thousands of glucose units linked to one another. Starches serve as a  storage form for carbohydrates. Much of the world's human population satisfies its energy needs with  the starches of rice, wheat, corn, and potatoes.  Two other important polysaccharides are glycogen and cellulose.  Glycogen  is also composed of  thousands of glucose units, but the units are bonded in a different pattern than in starches. Glycogen  is the form in which glucose is stored in the human liver. Cellulose is used primarily as a structural  carbohydrate. It is also composed of glucose units, but the units cannot be released from one  another except by a few species of organisms. Wood is composed chiefly of cellulose, as are plant 
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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.

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