Question

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence of DNA:

Options

• indicating that DNA has a double helix structure.

• showing equal numbers of purines and pyrimidines.

• showing the bases of DNA were held together by hydrogen bonds.

• revealing the structure of the deoxyribose sugar.

Answer 1

indicating that DNA has a double helix structure.

Explanation:

 Rosalind Franklin's famous Photo 51, produced using X-ray diffraction, provided the visual “X” pattern that was the definitive clue for a helical structure. This data allowed Watson and Crick to conclude that the molecule was a double helix with a uniform diameter.