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70th anniversary of the discovery of DNA’s structure

BBC Inside Science

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The Double Helix and the Evolution of Genes

It wasn't obvious immediately that DNA was definitely the genetic material at all, right? Well, the greatest secret wasn't actually about the molecule. It was about what the molecule does - and most people today don't think that life began with DNA. Life began with RNA, these tiny little molecules that can actually affect the world. They're a kind of enzyme. They can alter the speed of chemical reactions. If you've got a lump of DNA or a string, a molecule sitting there, it won't do anything. It needs a cell. And as people worked out how protein synthesis works, that is how genes turn, create, enable the cell to create proteins, then it became increasingly

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