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Water, pH and Macromolecules

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

DNA
Phospholipid
Strong base
Protein

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

its conjugate base
its conjugate acid
highly reactive
a hydronium ion

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Water, pH and Macromolecules
The pH of a solution is determined by

relative concentration of acids and bases
environmental effect
concentration of salt
dielectric constant of the medium

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

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

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

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

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

sodium chloride
argon
methane
gasoline (heptanes & octanes)

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