Water, pH and Macromolecules
Weak acids generally have pKa

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

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Water, pH and Macromolecules
Which of the following character does not apply to water?

The water molecule readily forms hydrophobic interactions
All three atoms in the water molecule readily form hydrogen bonds
The water molecule is asymmetric
The covalent bonds in water are highly polarized

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Water, pH and Macromolecules
Which of the following statements about covalently bonded molecules is false?

Electrons are shared between the atoms that make up the molecule
The chemical bonds that hold the molecule together are relatively strong
Noncovalent bonds may also be present, especially if the molecule is large
Such molecules often result from the interaction of ionized atoms

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