Question

which scientists work first suggested that dna had the shape of a helix?
multiple choice
rosalind franklin
james watson
francis crick
martha chase

Explanation:

Rosalind Franklin used X - ray crystallography to study DNA. Her famous "Photo 51" provided crucial evidence that DNA had a helical structure. James Watson and Francis Crick later used this information (along with other data) to build the double - helix model of DNA. Martha Chase is known for the Hershey - Chase experiment which showed that DNA is the genetic material, not protein.

Answer:

Rosalind Franklin