Solution:
Nucleotide arrangement in DNA can be seen by X-ray crystallography. Watson and Crick, 1953 proposed the double helical model for DNA. They were awarded Nobel prize in 1962 . This model was developed by them on the basis of several previous observations including the d-helix of Pauling, 1951 and \(X\)-ray reflection studies of Franklin and Gosling, \(1953 .\)
