Multiple Choice
Which of the following statements is true of DNA but not RNA?
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14. DNA Synthesis
Discovering the Structure of DNA
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How did Rosalind Franklin contribute to the understanding of DNA structure?
A
She identified the four nucleotide bases of DNA.
B
She produced X-ray diffraction images that revealed the helical structure of DNA.
C
She discovered the base pairing rules of DNA.
D
She developed the double helix model of DNA.
Verified step by step guidance1
Rosalind Franklin was a pioneering scientist who used X-ray diffraction techniques to study the structure of DNA.
X-ray diffraction involves directing X-rays at a crystallized sample and analyzing the pattern of rays that are scattered by the sample. This technique can reveal detailed information about the molecular structure.
Franklin's most famous contribution was Photograph 51, an X-ray diffraction image of DNA that showed a clear pattern indicating a helical structure.
Her work provided crucial evidence that DNA is a double helix, which was a key insight for other scientists, such as Watson and Crick, who later developed the double helix model.
Although Franklin did not develop the double helix model herself, her X-ray diffraction images were instrumental in confirming the helical nature of DNA, thus significantly contributing to the understanding of its structure.
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