Lecture One - Chemical Interactions

Lecture One - Chemical Interactions - How does the cellular...

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How does the cellular environment influence molecular interactions? I. What makes water essential for life? water as an organizing principle water as a solvent water as a reactant water is the environment(or solvent) in which the reactions and interactions between molecules in living systems occur. typical eukaryotic cell: 65-70% human body: 65% II. What chemical properties contribute to water's ability to dissolve molecules? polarity and H-bonding both properties contribute to water's solvent reversible ionization properties, but note that water can also be a reactant III. Covalent bonds stable typical energy released: 50-200 kcal/mol shared arrangements of electrons a) equal sharing, uniform charge distribution: molecule is non polar b) unequal sharing, asymmetrical distribution: molecule is polar because the bond involves an electronegative atom: O>N>S>C>P>H IV. Most electronegative atoms: oxygen > nitrogen > sulfur polar electrons not equally shared between bonds
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This note was uploaded on 03/19/2012 for the course BIO 2000 taught by Professor Ewr during the Spring '12 term at Alabama.

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Lecture One - Chemical Interactions - How does the cellular...

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