One - Chemical Interactions

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

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1/20/12 MCB 2000 Lecture 1 How does the cellular environment influence molecular interactions?
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1/20/12 MCB 2000 Lecture 1 What Water Essential Makes For Life?
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1/20/12 MCB 2000 Lecture 1 What makes water essential for life? Water as an organizing principle Water as solvent Water as a reactant
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1/20/12 MCB 2000 Lecture 1 Human body: 65% Water is the environment (or solvent) in which the reactions and interactions between molecules in living systems occur . Typical eukaryotic cell: 65-70%
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1/20/12 MCB 2000 Lecture 1 What chemical properties contribute to water’s ability to dissolve molecules? Polarity and H-bonding Reversible ionization Both properties contribute to water’s solvent properties, but note that water can also be a reactant.
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1/20/12 MCB 2000 Lecture 1 Covalent bonds Stable Typical energy released: 50-200 kcal/mol Shared arrangement of electrons Equal sharing, uniform charge distribution: molecule is nonpolar Unequal sharing, asymmetrical distribution: molecule is polar because the bond involves an electronegative atom: O>N>S >C>P>H
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MCB 2000 Lecture 1 polar electrons not equally shared between bonds relatively reactive Most Electronegative Atoms: Oxygen> Nitrogen >Sulfur
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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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One - Chemical Interactions - How does the cellular...

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