Ch_03 - Lifes Components Water, pH, and Biological...

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Life’s Components Water, pH, and Biological Molecules The Importance of Water to Life 71 percent of Earth s surface, 66 percent of weight of human body. Important properties of water. Required/generated by many cellular reactions (breaking down food). Important solvent hydrogen bonds with polar or charged molecules (NaCl). Important Properties of Water Solid versus liquid densities, importance for marine organisms. Specific heat (importance for insulating Earth, and for cooling living organisms by sweating). Cohesion and surface tension. Hydrophobic versus hydrophilic molecules. Acids and Bases Common acids (vinegar) and common bases (lye). Definition of an acid substance that yields hydrogen ions in solution (HCl). Definition of a base substance that accepts hydrogen ions (NaOH).
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pH Scale Logarithmic: lower pH = more acidic; higher pH = more basic, or alkaline. pH and health: asthma, cardiac arrest, vomiting as result of
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This note was uploaded on 02/25/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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Ch_03 - Lifes Components Water, pH, and Biological...

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