Question

analyzing dna structure

1. rosalind franklin used what technique in her study of dna molecules?

a. black-and-white photography
b. dna fingerprinting
c. wire and cardboard models
d. x-ray diffraction

Explanation:

Rosalind Franklin was a key researcher in DNA structure discovery. She used X-ray diffraction to capture images of DNA, which provided critical data for deducing its double-helix shape. The other options are incorrect: black-and-white photography was not her core technique, DNA fingerprinting is a later forensic method, and wire/cardboard models were used by Watson and Crick, not Franklin.

Answer:

D. X-ray diffraction