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Water, pH and Macromolecules

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

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

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Water, pH and Macromolecules
If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

It will form a membrane in water
It will be attracted to water
be repelled by water
It will act as a buffer and stabilize the pH

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

noncovalent
covalent
hydrogen
ionic

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

both (a) and (b)
concentration of the conjugate base to the weak acid
molar concentration of the buffer components
temperature of buffer components

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

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

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

All of these
Indole
Imidazole
Guanidinium ion

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