BIO LECTURE4 - Bio 9/4/09 (Lecture 4) Macromolecules: 1....

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Bio 9/4/09 (Lecture 4) Macromolecules: 1. energy molecules Water and carbon Polymerization Carbohydrates Lipids Chemical composition of matter Water: - HOH - Partial negative charge on the ocygen, partial positive charge on the hydrogens. - Bonds are polar covalent: covalent, but with 2 atoms that differ in electronegativity - This allows water to make Hydrogen BondsL weak bonds with strong cohesive effects - Water is a solvent: table salt, sodium chloride, separates in water into clorine and sodium ions - Water is less dense as a solid than it is as a liquid; ice floats Carbon: - can be assymetrical (chiral) - tetravalence allows the possibility of assymetrical handedness if four different types of atoms share bonds with carbon - optical isomers (Enantiomers): if four different atoms share bonds with carbon, their spatial arrangement defines different compounds called optical isomers (mirror images); formula and functional groups are identical, BUT the 3-D geometry around carbon atoms is different, so the chemical properties differ
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This note was uploaded on 11/05/2009 for the course B 101 taught by Professor Staff during the Fall '08 term at Cornell University (Engineering School).

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BIO LECTURE4 - Bio 9/4/09 (Lecture 4) Macromolecules: 1....

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