NUR1 200 Lecture 6: Class 6
10 May 2016
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Document Summary
Photosynthesis in plants converts co2 and h2o into plant carbohydrates (eg. cellulose, sugars and starch) Sugars and starch from plants sources are dietary staples throughout the world. Oxidation of carbohydrates is the main energy-yielding pathway in human cells. Carbohydrates also form part of glycoconjugates ie. glycoproteins, glycoplipids. Most abundant monosaccharide is d-glucose or dextrose (same things) Oligosaccharides are short chains of 3-9 monosaccharide residues linked together by glycosidic bonds. Oligosaccharides of three or more units are often joined to proteins or lipids to form glycoconjugates glycoproteins or glycolipids. Glycoconjugates are found either inside cells or on the cell surface or are secreted by cells. Monosaccharides with 5 or + carbons exist predominantly in cyclic form in solution. Cyclic form is the lowest energy configuration. Most stable form = less atp (atropine) Formation of the two cyclic forms of d-glucose. 2 stereoisomers, the & anomers differ only in stereochemistry around hemiacetal carbon. The interconversion of and anomers is called mutarotation.
