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WATER, PH AND MACROMOLECULES

Water, pH and Macromolecules
Which of the following organic groups are found in naturally occuring amino acids?

Imidazole
All of these
Guanidinium ion
Indole

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

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

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

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

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Water, pH and Macromolecules
The reactions of molecules

are independent of the functional groups
All of these
require an enzyme in all cases
are the reactions of the functional groups

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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?

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

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