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Water, pH and Macromolecules

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

acids
ions
molecules
none of these

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

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

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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
Which of the following acid/base pairs act as natural buffers in living systems?

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

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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
The strength of an acid depends on

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

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