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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?

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?

Imidazole
All of these
Indole
Guanidinium ion

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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
is probably held together by noncovalent bonds
contains at least some polar covalent bonds
does not dissolve well in water

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Water, pH and Macromolecules
A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?

DNA
Protein
Strong base
Phospholipid

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

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

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Water, pH and Macromolecules
The strength of an acid depends on

number of double bonds
number of protons released
electronegativity
number of neutrons gain

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