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Monosaccharide

Organic Chemistry Lecture 23

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Chapter 23 ? 2010, Prentice Hall Organic Chemistry, 7th Edition L. G. Wade, Jr. Carbohydrates and Nucleic Acids Chapter 23 * Carbohydrates Synthesized by plants using sunlight to convert CO2 and H2O to glucose and O2. Polymers include starch and cellulose. Starch is a storage unit for solar energy. Most sugars have formula Cn(H2O)n, ?hydrate of carbon.? Chapter 23 Chapter 23 * Classification of Carbohydrates Monosaccharides or simple sugars: polyhydroxyaldehydes or aldoses polyhydroxyketones or ketoses Disaccharides can be hydrolyzed to two monosaccharides. Polysaccharides hydrolyze to many monosaccharide units. For example, starch and cellulose have > 1000 glucose units. Chapter 23 Chapter 23 * Monosaccharides Classified using three criteria:

Sugars

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Chemical Components of Cells - Part I: Sugars 1/14 Living organisms are chemical systems Cells contain relatively few elements The distribution of elements differs dramatically from living organisms to inanimate matter Mostly carbon, nitrogen, oxygen, and hydrogen Why do living organisms contain so much hydrogen and oxygen? Water is the most abundant molecule in the cell Atoms can interact with each other through covalent and non-covalent bonds MOLECULES ARE COVALENTLY BONDED ATOMS Result from the sharing of electrons & form the backbone of molecules Strong molecular bonds that require energy to make and break The number of electrons in the outer shell determine reactivity* Not always shared equally (i.e. Polar vs non-polar molecules)
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