Each base pair sits how far from the next along the helix?

1. Two related measurements describe the rise of the helix. 2. Each base pair is separated from the other base pair by a distance of 0.34 nanometres. 3. Each turn of the helix measures 3.4 nanometres. 4. 3.4 nanometres is therefore the trap: that is a full turn, not a single step. 5. Dividing one by the other gives the number of base pairs per turn. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 14 'DNA Structure and Function', sections 14.1-14.6_