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Chapter 22 and 23
Carbohydrates and Carbohydrate Metabolism
25
Chemistry
Undergraduate 1
03/24/2009

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Term
Carbohydrates
Definition
A member of a large class of naturally occuring polyhydroxy ketones and aldehydes
Term
Monosaccharide (simple sugar)
Definition
A carbohydrate with 3-7 carbon atoms
Term
Aldose
Definition
A monosaccharide that contains an aldehyde carbonyl group
Term
Ketose
Definition
A monosaccharide thta contains a ketone carbonyl group
Term
Disaccharide
Definition
A carbohydrate composed of two monosaccharides
Term
Polysaccharide (complex carbohydrate)
Definition
A carbohydrate that is a polymer of monosaccharides
Term
Diastereomers
Definition
Stereoisomers that are not mirror images of each other
Term
Fischer projection
Definition
Structure that represents chiral carbon atoms as the intersections of two lines, with the horizontal lines representing bonds pointing out of the page and the vertical lines representing bonds pointing behind the page. For sugars, the aldehyde or ketone is at the top.
Term
D Sugar
Definition
Monosaccharide with the -OH group on the chiral carbon atom farthest from teh carbonyl group projecting to the right in a Fischer projection
Term
L Sugar
Definition
Monosaccharide with the -OH group on the chiral carbon atom farthest from the carbonyl group pointing to the left in a Fischer projection
Term
Anomers
Definition
Cylcic sugars that differ only in positions of substituents at the hemiacetal carbon (the anomeric carbon); the alpha form has the -OH on the opposite side from the -CH2OH; the Beta form has the -OH on teh same side as the -CH2OH
Term
Anomeric Carbon Atom
Definition
The hemiacetal C atom in cyclic sugar; the C atom bonded to an-OH group and an O in the ring.
Term
Mutarotation
Definition
Change in rotation of plane-polarized light resulting from the equilibrium between cyclic anomers and the open-chain form of a sugar.
Term
Glycoside
Definition
A cyclic acetal formed by reaction of a monosaccharide with an alcohol, accompanied by loss of H2O.
Term
Glycosidic bond
Definition
Bond between the anomeric carbon atom of a monosacchride and an -OR group
Term
1,4 link
Definition
A glycosidic link between the hemiacetal hydroxyl group at C1 of one sugar and the hydroxyl group at C4 of another sugar.
Term
Glycoprotein
Definition
A protein that contains a short carbohydrate chain.
Term
Digestion
Definition
A general term for the breakdown of food into small molecules.
Term
Pentose Phosphate Pathway
Definition
The biochemical pathway that produces ribose (a pentose), NADPH, and other sugar phosphates from glucose; an alternative to glycolysis.
Term
Glycolysis
Definition
The biochemical pathway that breaks down a molecule of glucose into two molecules of pyruvate plus energy
Term
Fermentation
Definition
The production of energy under anerobic conditions
Term
Alcoholic Fermintation
Definition
Teh anaerobic breakdown of glucose to ethanol plus carbon dioxide by the action of yeast enzymes
Term
Glycogenesis
Definition
The biochemical pathway for synthesis of glycogen
Term
Glycogenolysis
Definition
The biochemical pathway for breakdown of glycogen to free glucose.
Term
Gluconeogenesis
Definition
The biochemical pathway for the synthesis of glucose from noncarbohydrates, such as lactate, amino acids, and glycerol.
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