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PROTEIN STABILITY

Protein Stability
Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein

only at the ends of a-helices
only on Pro residues
rarely
only at the turns connecting p-strands

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Protein Stability
For the unfolding reaction of Protein G, ΔH° =210.6 kJ/mol, this means that

the entropy is positive at all temperatures
unfolding is favored enthalpically
the entropy is negative at all temperatures
folding is favored enthalpically

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Protein Stability
Attractive Vander Waals forces occur between

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

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Protein Stability
Which of the following forces is the most favorable for protein folding?

Hydrophobic Interactions
Vander Waals interactions
Hydrogen bonds
Conformational entropy

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Protein Stability
At the midpoint of a temperature transition curve,

[Native] = [Unfolded]
Keq = 1.0 and ΔG = 0
All of these
half of the protein is denatured

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