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Water, pH and Macromolecules

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

noncovalent
hydrogen
ionic
covalent

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

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

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Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen bonds
hydrogen atoms
carbon atoms
covalent bonds

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Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

1014 M
107 M
10-14 M
10-7 M

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

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

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Water, pH and Macromolecules
Which of the following organic groups are found in naturally occuring amino acids?

Indole
Imidazole
All of these
Guanidinium ion

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