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
Such molecules often result from the interaction of ionized atoms
Electrons are shared between the atoms that make up the molecule
The chemical bonds that hold the molecule together are relatively strong

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Water, pH and Macromolecules
Buffer solutions

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

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