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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-
Histidine+/histidine
All of these

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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
contains at least some polar covalent bonds
does not dissolve well in water
should act as a good buffer for acids and bases

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

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

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Water, pH and Macromolecules
Who discovered and described the blood groups (ABO) classification?

Otto Warburg
Karl Hooper
Karl Landsteiner
Theodor Kocher

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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
The effectiveness or capacity of a buffer solution can be affected by

molar concentration of the buffer components
concentration of the conjugate base to the weak acid
temperature of buffer components
both (a) and (b)

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