Protein Stability
Attractive Vander Waals forces occur between

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

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Protein Stability
Since ΔG° = -RTlnK

a 10-fold decrease in K decreases ΔG° by about 2.3*RT
a 10-fold increase in K decreases ΔG° by about 10-fold
a 10-fold increase in K decreases ΔG° by about 2.3*RT
a 10-fold decrease in K increases ΔG° by about 10-fold

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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
Charged amino acids are seldom buried in the interior of a protein
Tyrosine is only found in the interior of proteins

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