A d-amino acid would interrupt an helix made of l-amino acids.Another naturally occurring hindrance to the formation of an 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.
Correct Answer:
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