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An α helix is stabilized by:a)intrachain hydrogen bonds between the carbonyl oxygen of a residue and the amide hydrogen of the fourth residue away.b) extrachain hydrogen bonds between the carbonyl hydrogen of a residue and the amide oxygen of the third residue away.c) intrachain nitrogen bonds between the carbonyl nitrogen of a residue and the amide nitrogen of the sixth residue away.d) intrachain nitrogen bonds between the carbonyl nitrogen of a residue and the amide nitrogen of the second residue away.e) extrachain oxygen bonds between the carbonyl oxygen of a residue and the amide nitrogen of the fifth residue away.
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