Question

Watson and Crick (1953) proposed DNA was based on
(i) X-ray diffraction studies studies of DNA dne by Wilkins and Franklin
(ii) Chargaff\'s base equivalence rule
(iii)Griffith\'s transformation experiment
(iv) Meselson and Stahl\'s experiment.

Answer 1

Answer:

option no. 1

is the correct answer

Answer 2

In 1953, James Watson and Francis Crick based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin, proposed double helix model for the structure of DNA. One of the hallmarks of their proposition was base pairing between two strands of polynucleotide chains. However, this proportion was also based on the observation of Erwin Chargaff (1950) that for a double stranded DNA, the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equals one.
So, the correct answer is '(i) and (ii)'.