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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?

Guanidinium ion
Indole
Imidazole
All of these

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

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

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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?

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

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

Histidine+/histidine
All of these
H2CO3/HCO3-
H2PO4-/HPO42-

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

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

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Water, pH and Macromolecules
Which of the following alcohols would be most soluble in water?

octanol
ethanol
butanol
methanol

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