Water, pH and Macromolecules
Buffer solutions

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

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

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

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