Water, pH and Macromolecules
Most of the important functional groups in biological molecules contain

oxygen and a phosphate
oxygen and/or nitrogen and are acidic
oxygen and/or nitrogen and are polar
nitrogen and a phosphate

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Water, pH and Macromolecules
Buffer solutions

tend to maintain a relatively constant pH.
cause a decrease in pH when acids are added to them.
are rarely found in living systems
will always have a pH of 7

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