Ch.12Notes

Ch.12Notes - Chemistry and Membrane Function I Molecules...

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Chemistry and Membrane Function I. A. Ionic Reactions (rxns) 1. Ions = atoms w/charge from e- gain/loss -- E.g. Sodium => sodium ion (Na+) by donating e- ; CI => Cl- by accepting one 2. Ionic bonds: attraction between oppositely charged ions; e.g. Na+ & C1- react => NaCI B. Covalent bonds: e- shared II. Important inorganic molecules A. Water: polar molecule B. Acids: molecules dissociate in H 2 O, release H+ -- Example: HCI C. Bases: molecules take up H+/release OH- hydroxyl ions -- Example: NaOH D. pH scale shows acidity/basicity of solution 1. RangesfromO-14 pH of 7 is neutral; pH <7 is acidic (more H+); pH > 7 is basic (less H+, more OH-) 2. Buffers keep pH steady by taking up excess H+, OH- IV. Important organic molecules -- Are mostly polymers (macromolecules) made of monomer building blocks Monomers => polymer + H 2 O (dehydration synthesis) Polymer + H 2 O => monomers (hydrolysis) A. Proteins: (structure, metabolism) 1. 20 different amino acid monomers (Aas) joined by peptide bond to form
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This note was uploaded on 01/17/2012 for the course BIOL 103 taught by Professor Robertwest during the Spring '12 term at Lee.

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Ch.12Notes - Chemistry and Membrane Function I Molecules...

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