The distance per base pair in B-DNA is_____

Answer

To find the distance per base pair in B-DNA, we can follow these steps:

1. **Understand B-DNA Structure**: B-DNA is the most common form of DNA in biological systems. It has a double helical structure with a specific diameter and spacing between the base pairs.

2. **Identify Key Measurements**: The diameter of B-DNA is approximately 20 Ångströms (Å). This measurement helps us visualize the overall structure but is not directly related to the distance between base pairs.

3. **Determine Base Pair Arrangement**: In B-DNA, the structure consists of turns. Each complete turn of the helix contains a specific number of base pairs.

4. **Count Base Pairs per Turn**: In B-DNA, there are about 10 base pairs per complete turn of the helix.

5. **Calculate Distance Between Base Pairs**: The distance between each base pair in B-DNA is approximately 3.4 Ångströms. This value is derived from the overall structure and arrangement of the base pairs within the helical form.

6. **Final Answer**: Therefore, the distance per base pair in B-DNA is 3.4 Ångströms.