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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

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

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

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

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Water, pH and Macromolecules
The reactions of molecules

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

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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?

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

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