In an α helix, the position of an amino acid residue relative to its neighbors is important. The interactions in these neighboring amino acid side chains have a significant effect on the stability of α helical structures.
An α helix would be destabilized most by:
A. interactions between neighboring Asp and Arg residues
B. the presence of an Arg residue near the carboxyl terminus of the α helix
C. the presence of two Lys residues near the amino terminus of the α helix
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