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Water, pH and Macromolecules

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

argon
sodium chloride
gasoline (heptanes & octanes)
methane

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

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

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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?

DNA
Protein
Strong base
Phospholipid

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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Water, pH and Macromolecules
H2O and CH4 are both examples of

molecules
acids
ions
none of these

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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
All of these
contain protons and neutrons in their atomic nuclei
can all form covalent bonds with other elements

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