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
Noncovalent bonds may also be present, especially if the molecule is large
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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Water, pH and Macromolecules
Buffer solutions

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

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

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

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