L#04%2008-25-11%20Ch2%20water%2c%20pH%20macromolecules

L#04%2008-25-11%20Ch2%20water%2c%20pH%20macromolecules -...

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Biology 1103 – Lecture #4 08-25-11 Today’s lecture is based on portions of Chapters 2 and 4.
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WATER Living things are75-95% water 71% of the Earth’s surface is ocean water Human body is around 66% water by weight
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Polar water molecule
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HYDROGEN BOND Attraction between hydrogen atoms with a partial positive charge and an atom – like oxygen- with a partial negative charge
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Polarity of water molecule results in hydrogen bonding
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ICE
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LIQUID
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GAS
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Water as a solvent
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Water as a solvent
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Water–soluble protein
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Dissociation of water H 2 O  H+ + OH- Hydrogen Ion (H+) Hydroxide Ion (OH-)
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Water dissociation
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Unformatted text preview: Hydrogen ion H+ Hydroxide ion OH-Dissociation of water H+ Acid OH- Base pH is a measure of the hydrogen ion concentration. 7 = neutral At equilibrium in pure water at 25 C [H + ] = [OH-] = 1/10,000,000 = 10-7 moles of H+ = pH of 7 Below 7 is Acid Above 7 is Basic Life is based on the carbon atom The carbon cycle Monomers and Polymers Mono = alone, single, one Poly = much, many Macromolecules monomer Proteins amino acids Carbohydrates simple sugars Lipids fatty acids and glycerol Nucleic acids nucleotides...
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This note was uploaded on 09/08/2011 for the course BIOL 1103 taught by Professor Armstrong during the Spring '07 term at University of Georgia Athens.

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L#04%2008-25-11%20Ch2%20water%2c%20pH%20macromolecules -...

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