Chapter_11

Chapter_11 - Chapter 11 Carbohydrates 4 Major Classes of...

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Unformatted text preview: Chapter 11 Carbohydrates 4 Major Classes of Biomolecules: Proteins, nucleic acids, carbohydrates and lipids Carbohydrates are used as energy stores, components of nucleic acids, components of cell walls (in bacteria and plants), as appendages to proteins and lipids Built from monosaccharides into a variety of polysaccharides Chapter 11 Read pp 303-319 Monosaccharides The 3 Trioses Fischer Projections: Enantiomers: mirror images D and L refer to the configuration of the assymetric carbon furthest from the aldehyde or keto Carbon-hydrate (C-H2O)n Diastereomers: isomers that are not mirror images Epimers: differ in configuration at a single asymmetric center D-aldoses Containing 3-6 Carbons Orientation of asymmetric carbon in red indicates classification as D-aldose D-Ketoses with 3-6 Carbons 1 less asymmetric carbon than aldoses Red asymmetric carbon determines the designation D-fructose is most abundant Which of the following statements about prothrombin are incorrect? I t i s a n c h o r e d t o p l a t e l . . I t i s p a r t o f t h e c o m m o n . . . I t i s i n v o l v e d i n i n i t i a t i n g . . . I t i s i n v o l v e d i n h a l t i n g . . . I t r e q u i r e s v i t a m i n K f o r . . . 20% 20% 20% 20% 20% 1. It is anchored to platelet spholipid membranes through Ca+2 bridges 2. It is part of the common pathway of clotting 3. It is involved in initiating clots Cyclized Pentoses and Hexoses Cyclization of 6 membered ring in this way leads to a pyranose (hemiacetal, hemiketal) of furanose (hemiketal) Anomeric carbon at blue position Equilibrium mixture of glucose: 1/3 , 2/3 , < 1% open chain Haworth projection Furanose Rings are in Nucleic Acid Sugars...
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This note was uploaded on 09/13/2010 for the course BIOL 4087 taught by Professor Waldrop during the Spring '08 term at LSU.

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Chapter_11 - Chapter 11 Carbohydrates 4 Major Classes of...

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