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Water, pH and Macromolecules

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

Karl Landsteiner
Karl Hooper
Otto Warburg
Theodor Kocher

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

Imidazole
All of these
Indole
Guanidinium ion

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

a hydronium ion
highly reactive
its conjugate acid
its conjugate base

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Water, pH and Macromolecules
Most of the important functional groups in biological molecules contain

oxygen and/or nitrogen and are polar
oxygen and a phosphate
nitrogen and a phosphate
oxygen and/or nitrogen and are acidic

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

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

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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