Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

contain protons and neutrons in their atomic nuclei
All of these
can all form covalent bonds with other elements
are common elements in the molecules that make up living organisms

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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
It is critical for many of the chemical processes found in living systems
All of these
Polar substances that can form hydrogen bonds will dissolve in it

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Water, pH and Macromolecules
Buffer solutions

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

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