Multiple Choice
In the DNA double helix, what structural feature gives DNA an overall negative charge at physiological pH?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Who proposed the first accurate model of DNA structure (the double helix) in 1953?
A
Gregor Mendel
B
Erwin Chargaff
C
James Watson and Francis Crick
D
Rosalind Franklin and Maurice Wilkins
Verified step by step guidance1
Understand that the question is about the historical discovery of the DNA structure, specifically the first accurate model proposed in 1953.
Recall that Gregor Mendel is known as the father of genetics for his work on inheritance patterns in pea plants, but he did not work on DNA structure.
Recognize that Erwin Chargaff discovered base pairing rules (Chargaff's rules), which were crucial for understanding DNA but did not propose the structure itself.
Note that Rosalind Franklin and Maurice Wilkins contributed critical X-ray diffraction images of DNA that provided key evidence for the structure but did not propose the model.
Identify that James Watson and Francis Crick used available data, including Chargaff's rules and Franklin's images, to propose the first accurate double helix model of DNA in 1953.
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