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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?

All of these
Indole
Guanidinium ion
Imidazole

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

at pH values around any of their pKa's
at pH values around neutrality
if their concentration is kept low
only in combination with polyprotic bases

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

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

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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

are common elements in the molecules that make up living organisms
contain protons and neutrons in their atomic nuclei
can all form covalent bonds with other elements
All of these

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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
hydrogen bonds
covalent bonds
carbon atoms

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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