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What was the main technological advancement that contributed to Crick and Watson working work out the structure of the DNA double-helix?

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Final answer:

Rosalind Franklin used X-ray diffraction methods to demonstrate the helical nature of DNA, while Watson and Crick formulated the double-stranded structural model of DNA.

Step-by-step explanation:

Rosalind Franklin used X-ray diffraction methods to demonstrate the helical nature of DNA, while Watson and Crick formulated the double-stranded structural model of DNA.

Franklin's X-ray diffraction images of DNA fibers provided crucial insights into the structure of DNA, which Watson and Crick used to piece together the puzzle of the DNA molecule.

The X-ray diffraction pattern showed that DNA had a helical shape, leading to Watson and Crick's proposal of the double helix structure.

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