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Water, pH and Macromolecules

Water, pH and Macromolecules
The strength of an acid depends on

electronegativity
number of neutrons gain
number of double bonds
number of protons released

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

All of these
Guanidinium ion
Imidazole
Indole

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

covalent bonds
hydrogen atoms
carbon atoms
hydrogen bonds

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

should act as a good buffer for acids and bases
contains at least some polar covalent bonds
does not dissolve well in water
is probably held together by noncovalent bonds

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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 negative charge
are not important for the properties of water
carry a partial positive charge

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

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

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