Water, pH and Macromolecules
Weak acids generally have pKa

pKa values greater than 2
been seldom found in living systems
values less than 1
that cannot be used to buffer

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

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

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Water, pH and Macromolecules
Hydrogen bonds and hydrophilic interactions are types of

strong chemical bonds that link together separate molecules
weak chemical bonds that link together separate molecules
weak chemical bonds that hold together the atoms within a molecule
strong chemical bonds that hold together the atoms within a molecule

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

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

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