Which of the following was a contribution Rosalind Franklin made to the understanding of DNA?
a) Used X-ray diffraction to show that the structure of DNA is helical
b) Determined that DNA contains four different nitrogenous bases
c) Found that "the transforming principle" is destroyed by enzymes that hydrolyze DNA
d) Found that the phosphorus containing components are the genetic material of phages
e) Discovered "the transforming principle" that could genetically alter bacteria.
Ans: a) Used X-ray diffraction to show that the structure of DNA is helical
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