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Water, pH and Macromolecules

Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

10-7 M
10-14 M
107 M
1014 M

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

carry a partial negative charge
form covalent bonds in ice
are not important for the properties of water
carry a partial positive charge

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

All of these
Indole
Imidazole
Guanidinium ion

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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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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

does not dissolve well in water
is probably held together by noncovalent bonds
should act as a good buffer for acids and bases
contains at least some polar covalent bonds

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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
both (a) and (b)
temperature of buffer components

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