Limited access

Upgrade to access all content for this subject

Rosalind Franklin produced an X-ray image that helped Watson and Crick determine the width of a DNA molecule.

Which of the following BEST explains what this information helped them realize?


Bonding between two purines would be consistent with the diameter of the DNA helix.


Chargaff’s Rule did not apply to the DNA molecule.


Bonding between a purine and pyrimidine would be consistent with this width of a DNA helix since each rung has a three-ring molecular dimension.


Adenine must bond with cytosine, and guanine must bond with thymine on each rung of the DNA ladder to accommodate for a proper diameter of the double helix.

Select an assignment template