The double helix structure of DNA was proposed in 1953 by
Correct answer: C. Watson and Crick, using the X ray diffraction data of Rosalind Franklin
- A. Mendel and Morgan
- B. Griffith and Avery
- C. Watson and Crick, using the X ray diffraction data of Rosalind Franklin
- D. Sanger and Gilbert
Explanation
Watson and Crick built the model from Franklin's X ray photographs, which showed the helix and its dimensions, together with Chargaff's finding that A equals T and G equals C. The structure immediately suggested how the molecule could be copied, since each strand is a template for the other. Griffith and Avery had earlier shown that DNA is the transforming material, and Sanger later developed sequencing.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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