A D-Amino Acid Would Interrupt An $\alpha$ Helix Made of L-Amino Acids

question 26

Multiple Choice

A D-amino acid would interrupt an $\alpha$ helix made of L-amino acids. Another naturally occurring hindrance to the formation of an $\alpha$ helix is the presence of:

• A) a negatively charged Arg residue.
• B) a nonpolar residue near the carboxyl terminus.
• C) a positively charged Lys residue.
• D) a Pro residue.
• E) two Ala residues side by side.

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