Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

All of these
can all form covalent bonds with other elements
contain protons and neutrons in their atomic nuclei
are common elements in the molecules that make up living organisms

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Water, pH and Macromolecules
The main difference between an acid and a base is that

acids are polar molecules and bases are not
bases are polar molecules and acids are not
acids donate hydrogen ions in water while bases accept hydrogen ions
bases donate hydrogen ions in water while acids accept hydrogen ions

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