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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Water, pH and Macromolecules
Which of the following statements about water is correct?

It is critical for many of the chemical processes found in living systems
All of these
Polar substances that can form hydrogen bonds will dissolve in it
Nonpolar substances like oils are not soluble in it

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