1) Some sugars are monsosaccharides, others are disaccharides, and starch and cellulose are polysaccharides. Most of the time, the monosaccharide is glucose, though sometimes it is fructose or galactose.
For example, glucose, C6H12O6, occurs by itself, as when you say, "Nurse! Put this dude on a glucose saline IV stat!" Fructose, which also has the formula C6H12O6, occurs in high-fructose corn syrup.
Sucrose, which is cane sugar, table sugar, or beet sugar, is a disaccharide of glucose covalently bonded to fructose. Lactose, which is milk sugar, is a disaccharide of glucose covalently bonded to galactose. Some adults lose the ability to digest lactose to glucose and galactose. When they drink whole milk, they get gas, cramps, and diarrhea. Supermarkets sell Lactaid milk, which has the lactose already hydrolyzed to glucose and galactose. Ah-h!
Starch is a polysaccharide of glucose molecules all linked by bonds that are called *alpha*. Cellulose has glucose molecules linked by *beta* bonds. Humans and other animals can digest starch to glucose and use it. Humans also build up glucose molecules by *alpha* bonds to store glycogen in the liver. But humans and other animals cannot digest cellulose to glucose. So cows and termites keep colonies of bacteria in their stomachs that can digest cellulose to glucose. So termites get the good out of wood, and cows chew their cud. Bacteria are really members of the plant kingdom.
2. Glycerol, glycerine, HOCH2-CHOH-CH2OH, remains unchanged.
3. A fatty acid has a large and even number of carbon atoms, like 18, whereas glycerol has the constant odd three carbon atoms. Glycerol is a tribasic alcohol, three -OH groups, whereas fatty acids have long hardocarbon tails and carboxyl -COOH groups.
2006-12-04 13:26:12
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answer #1
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answered by steve_geo1 7
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