Protein Stability
Attractive Vander Waals forces occur between

apolar molecules in the liquid state
polar molecules in the solid state
any pair of nearby atoms
only if other forces are less favorable

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Protein Stability
The correlation between free energy ΔG transfer between the aqueous/organic phases and the surface area of amino acid residues

ignores the important contribution of the peptide bond
is only meaningful for the polar amino acids
reflects the reduction in solvent-accessible area during protein folding
is similar to effects seen with SDS denaturation

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Protein Stability
Which of the following is the most correct?

Charged amino acids are never buried in the interior of a protein
All hydrophobic amino acids are buried when a protein folds
Tyrosine is only found in the interior of proteins
Charged amino acids are seldom buried in the interior of a protein

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