Alpha-helices have 3.6 amino acid residues per turn, ie a helix 36 amino acids long would form 10 turns, and The axial distance between adjacent residues is 3.5 Angstroms. Beta-helices have two residues per repeat unit which gives the beta-strand a 7 Angstrom pitch. This compares with the alpha-helix where the axial distance between adjacent residues is only 1.5 Angstroms. Then how many residues in an alpha-helix conformation would it take to traverse the same distance as 10 residues in beta-strand conformation?

Alpha-helices have 3.6 amino acid residues per turn, ie a helix 36 amino acids long would form 10 turns, and The axial distance between adjacent residues is 3.5 Angstroms.

Beta-helices have two residues per repeat unit which gives the beta-strand a 7 Angstrom pitch. This compares with the alpha-helix where the axial distance between adjacent residues is only 1.5 Angstroms.

Then how many residues in an alpha-helix conformation would it take to traverse the same distance as 10 residues in beta-strand conformation?