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Water, pH and Macromolecules

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

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

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Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

2 times more basic
100 times more acidic
10 times more acidic
10 times more basic

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

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Water, pH and Macromolecules
Weak acids generally have pKa

been seldom found in living systems
values less than 1
that cannot be used to buffer
pKa values greater than 2

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

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

covalent
ionic
hydrogen
noncovalent

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