Rewrtie this sentence dna was already thought to be important in the transference of hereditary information from cell to cell, but watson and crick’s structure showed how this worked on a molecular level, indicating the way genes, cells and ultimately all life forms reproduce.

DNA has always been an important factor/key role in the transference of hereditary information. However, Watson and Crick's structure demonstrated the process of how DNA worked on a molecular scale by indicating the way that genes, cells, and ultimately how all life forms reproduce.