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Water, pH and Macromolecules

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

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

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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
contains at least some polar covalent bonds
does not dissolve well in water

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Water, pH and Macromolecules
Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?

Haldanes equation
Henderson-Hasselbalch equation
Michaelis-Menten equation
Hardy-Windberg law

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Water, pH and Macromolecules
Most of the important functional groups in biological molecules contain

oxygen and/or nitrogen and are acidic
nitrogen and a phosphate
oxygen and a phosphate
oxygen and/or nitrogen and are polar

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

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

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

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