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

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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
folding is favored enthalpically
the entropy is negative at all temperatures

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Protein Stability
Attractive Vander Waals forces occur between

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

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

Hydrophobic Interactions
Hydrogen bonds
Vander Waals interactions
Conformational entropy

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Protein Stability
At the midpoint of a temperature transition curve,

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

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