Question

who provided x - ray diffraction photographs of purified dna fibers that suggested a helical structure with a consistent diameter of about 2 nm and a complete helical turn every 3.4 nm? multiple choice franklin hershey and chase chargaff watson and crick

Explanation:

Rosalind Franklin's X - ray diffraction images of DNA, particularly her famous Photo 51, provided crucial evidence for the helical structure of DNA with the given dimensions. Hershey and Chase's experiments were about DNA as the genetic material, Chargaff formulated rules about base - pair ratios, and Watson and Crick built the DNA double - helix model using data from others including Franklin.

Answer:

A. Franklin