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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
All of these
H2CO3/HCO3-
H2PO4-/HPO42-

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Water, pH and Macromolecules
A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?

Strong base
Phospholipid
Protein
DNA

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

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

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

Otto Warburg
Karl Landsteiner
Theodor Kocher
Karl Hooper

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

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

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Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen atoms
carbon atoms
hydrogen bonds
covalent bonds

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