In 1953, Watson and Crick were able to propose a model of DNA as a helical molecule with a sugar-phosphate backbone on the outside of the molecule.
Which of the following earlier discoveries was most instrumental to this important
discovery?

answer: c. two haploid cells

explanation:

b ti isnfornopgnoernfrof

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.