Question

What is the distance between base pairs in B-DNA?

Options

• 2.5 Å

• 3.4 Å

• 3.03 Å

• 3.8 Å

Answer 1

B-DNA has a distance of 3.4 Å between consecutive base pairs along the helix axis. This measurement, combined with approximately 10.4 base pairs per turn, results in the helix length of 34 Å, which is characteristic of the B-DNA form under physiologic conditions.