Cyclic Structure of Fructose. As a ketohexose, fructose forms a 5-membered ring when the hydroxyl on C-5 reacts with the carbonly on C-2. -D-Fructose. -D-Fructose. Dehydration of Carbohydrates: The Molisch Test.
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-D-Glucose Methanol Methyl--D-glucoside
C6H12O6 2C2H5OH + 2CO2
- all three are polymers of D-glucose, but they differ in the type of glycosidic bond and/or the amount of branching
- starch is found in plants and glycogen in animals
- the polymers take up less room than would the individual glucose molecules, so are more efficient for storage
- animals store glycogen in the liver (about a one-day supply in humans) and use it to maintain fairly constant blood sugar levels between meals
- cellulose forms -sheets of parallel strands held together by hydrogen bonding
- we don’t have the enzyme to break down cellulose
- some animals have microorganisms that do have the enzyme