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Which of the following discoveries played a key role in Watson and Crick’s discovery of DNA’s structure? (select all that apply)
A) Charagraffs discovery that DNA hold equal mounts of adenine and thymine, and equal amounts of guanine and cytosine.
B) Hershey and Chase's experiment with bacteriophage that confirmed DNA was heredity material.
C) Marie Curie's discovery of radium that enables x-ray images to be taken
D) Frankie and Wilkins x-ray diffraction images revealing DNA as a tightly coiled helix
The answer is A and D. At first, they are confused with the structure. All they know is the DNA is consists of A, T, C and G. After they know the number relationship, they figure out that base may be pairs(A&T, G&C). Then the X-ray helps them to get the coiled helix structure.
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