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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.

ionic
noncovalent
covalent
hydrogen

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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

5 x 10-7
7
1 x 10-7
7 x 10-7

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Water, pH and Macromolecules
The reactions of molecules

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

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

Indole
All of these
Imidazole
Guanidinium ion

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

ions
acids
none of these
molecules

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

at pH values around neutrality
at pH values around any of their pKa's
if their concentration is kept low
only in combination with polyprotic bases

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