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Alpha Helix Pitch and Rise

4. Protein Structure / Alpha Helix Pitch and Rise / Problem 6

Problem 6

If the pitch of an alpha helix is 5.4 angstroms and the rise is 1.5 angstroms, how many amino acid residues are there per turn?

A

4.5 residues

B

3.6 residues

C

4.0 residues

D

3.0 residues