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Unformatted text preview: substances in polymeric forms) o can auto-ionize o pure water is 55.5 M • Buffers: solutions that tend to resist pH change; typically a weak acid and its conjugate base o intracellular: phosphate and histidine systems o extracellular: bicarbonate system o good buffers: pKa is in physiological pH range and not influenced by divalent cations • Water’s Role in Environmental Fitness o powerful solvent o medium for ionization o thermal properties create constancy in climate (allow for effective temp regulation in living systems) o high surface tension o osmotic pressures determine shape/form of living things...
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This note was uploaded on 02/09/2010 for the course BIOL 3361 taught by Professor Zhang/spiro during the Fall '08 term at Dallas.
- Fall '08