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Buffers
________ are essential for keeping pH levels in live cells generally constant.
Acids
________ raise the relative concentration of H+ ions in a solution, whereas bases raise the concentration of OH- ions in a solution.
Biological systems
________ can be extremely sensitive to pH fluctuations.
Covalent bonds
________ (shared electrons) exist between the oxygen and hydrogen atoms in water.
Oxygen
________ has a high electronegativity (ability to attract electrons), whereas hydrogen has a low electronegativity.
Water molecules
________ are "sticky, "exhibiting cohesive and adhesive properties.
Pure water
________ will dissociate and create equal amounts of H+ and OH- ions, yielding a pH of 7.
Note 
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