Question

Which of the following statements is true regarding the discovery of the double helix? Choose 1 answer: (A) It was discovered that double-stranded DNA is a parallel molecule. Rosalind Franklin's x-ray crystallography provided Watson and Crick with important data that helped determine the structure of DNA. The experiments that led to the discovery of the double helix ultimately disproved Chargaff's rules regarding nitrogenous bases. James Watson, Francis Crick, Maurice Wilkins, and Rosalind Franklin were awarded the Nobel Prize in Medicine for their discovery of the double helix.

Answer 1

Solution

Option B is correct.because Rosalind franklins obtained the DNA crystallopgraphical data and which was used by watson and crick to determine double helix structure of DNA.crystallography of DNA was the idea of franklins not of wilkins.

OPTION A is incorrect because DNA helix is double stranded antiparallal molecule.

OPTION C is incorrect because double helix structure gives the idea to prove chargaffs rule of nitrogen bases.so DNA base pairing proving that chargoffs rule of nitrogen base pairing and there ratio are same as double helix of watson and crick.

OPTION D is incorrect because In 1962 Watson (b. 1928), Crick (1916–2004), and Wilkins (1916–2004) were awarded with noble price.because Rosalind franklin was died before that award distribution.