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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
Imidazole
Indole
Guanidinium ion

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

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

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

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

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Water, pH and Macromolecules
Which of the following will easily dissolve in a polar solvent?

sodium chloride
argon
gasoline (heptanes & octanes)
methane

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Water, pH and Macromolecules
The pH of a solution is determined by

environmental effect
concentration of salt
relative concentration of acids and bases
dielectric constant of the medium

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

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

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