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Water, pH and Macromolecules

Water, pH and Macromolecules
Which of the following will easily dissolve in a polar solvent?

argon
sodium chloride
methane
gasoline (heptanes & octanes)

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

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

hydrogen
noncovalent
covalent
ionic

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

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

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

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

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

Guanidinium ion
All of these
Imidazole
Indole

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