A: Watson, a physicist, and Crick, a zoologist, were awarded the Nobel prize in 1962. This is correct.
B: The data based on X-ray diffraction was used for DNA structure, which is correct.
C: Two nucleotides can be linked in the 5' to 3' direction through a phosphodiester bond, but this is not the best choice for this question.
D: CsCl gradient is used to measure the densities of DNA, which is correct.
Final Answer:
B, D