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Videos
The DNA Story - 1973
 James Watson
Author: James Watson
Length: 1:04
 Watch using MPG Size: 5.4MB
Transcript:
At that stage, they still hadn't completed the metal models of the bases that we wanted, so I had cut out some paper models
of the bases - not very accurate, but enough so I could put hydrogen atoms on different places to see where you might form
hydrogen bonds. Francis said that I should definitely think about Chargaff's rules, that adenine equals thymine and that guanine
equals cytosine. The next morning - I don't know why I didn't do it right away - it was a beautiful spring, and the next morning
I started playing with models, and I discovered that you could put adenine and thymine together in the exact same way that
you could put guanine and cytosine together. That was sort of the base pairs. I was immensely excited. Francis came in and
got a point that I hadn't gotten at all; that you could flip the pair so that adenine could be on either side of the thymine
pair.
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