Select correct properties of alpha-helices: O A. Small amino acids, glycine and alanine, are frequent in alpha-helices. O B. N-terminal and C-terminal regions of long alpha-helices are enriched with charged amino acid residues to compensate for the dipole charge created by aligned peptide groups. O C. Alpha-helices are stabilized by interactions between spatially adjacent peptide groups forming hydrogen bonds which are parallel to the peptide chain. O D. Alpha-helical structures may be created by two peptide chains. Activate Windows