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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?

All of these
Indole
Guanidinium ion
Imidazole

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

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

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

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

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Water, pH and Macromolecules
The reactions of molecules

All of these
are independent of the functional groups
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
Henderson-Hasselbalch equation
Michaelis-Menten equation

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