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Water, pH and Macromolecules

Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

2 times more basic
100 times more acidic
10 times more basic
10 times more acidic

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

Histidine+/histidine
All of these
H2PO4-/HPO42-
H2CO3/HCO3-

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Water, pH and Macromolecules
The reactions of molecules

require an enzyme in all cases
are independent of the functional groups
are the reactions of the functional groups
All of these

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Water, pH and Macromolecules
H2O and CH4 are both examples of

ions
none of these
molecules
acids

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

ionic
covalent
hydrogen
noncovalent

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

does not dissolve well in water
contains at least some polar covalent bonds
should act as a good buffer for acids and bases
is probably held together by noncovalent bonds

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