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Water, pH and Macromolecules

Water, pH and Macromolecules
Who discovered and described the blood groups (ABO) classification?

Theodor Kocher
Otto Warburg
Karl Landsteiner
Karl Hooper

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Water, pH and Macromolecules
The reactions of molecules

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

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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 effectiveness or capacity of a buffer solution can be affected by

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

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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Water, pH and Macromolecules
If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

be repelled by water
It will be attracted to water
It will act as a buffer and stabilize the pH
It will form a membrane in water

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