Multiple Choice
One strand of a DNA molecule has the base sequence 5′-ATAGGT-3′. The complementary base sequence on the other strand of DNA will be 3′- __________-5′.
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14. DNA Synthesis
Discovering the Structure of DNA
Multiple Choice
Rosalind Franklin is famous for which contribution to the study of DNA?
A
Taking X-ray diffraction images of DNA
B
Developing the double helix model
C
Identifying the sugar-phosphate backbone
D
Discovering the base pairing rules
Verified step by step guidance1
Understand the context: Rosalind Franklin was a scientist whose work significantly contributed to the understanding of DNA structure.
Identify the key technique: Franklin used X-ray diffraction, a method that involves directing X-rays at a crystallized sample and analyzing the pattern of the diffracted rays to infer the structure of the sample.
Recognize the significance: Her X-ray diffraction images, particularly Photo 51, provided critical evidence for the helical structure of DNA.
Connect to the options: While Franklin did not develop the double helix model herself, her images were crucial for Watson and Crick to propose the model. She also did not directly identify the sugar-phosphate backbone or discover base pairing rules.
Conclude with her contribution: Therefore, Rosalind Franklin is most famous for taking X-ray diffraction images of DNA, which were pivotal in understanding its structure.
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