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Water, pH and Macromolecules

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

gasoline (heptanes & octanes)
argon
sodium chloride
methane

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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?

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

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

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

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

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

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

Histidine+/histidine
H2CO3/HCO3-
All of these
H2PO4-/HPO42-

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

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

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