X-Ray Data Showed That the DNA Helix Undergoes One Complete

Question

X-ray data showed that the DNA helix undergoes one complete turn every
A) 2.0 angstroms.
B) 3.4 angstroms.
C) 20 angstroms.
D) 34 angstroms.
E) None of the choices are correct.

Accepted Answer

The X-ray data reveals that the DNA helix has a repeating distance of 34 angstroms, which corresponds to one complete turn of the helix. This distance represents the length of 10 base pairs, with each base pair contributing approximately 3.4 angstroms to the overall length of the helix. Therefore, the correct answer is D) 34 angstroms.