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The History of DNA
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The amount of certain bases always occurred in a one-to-one ratio.

Nitrogen bases always match up like this:

Adenine Ė Thymine and Cytosine -- Guanine

Slide 11

Rosalind Franklin (1920-1953)

Rosalind Franklin (1920-1953)

Using X-ray techniques took pictures of DNA and discovered the double helix shape of DNA.

Died of cancer due to unknown harmful affects of X-ray

Slide 12

James Watson and Francis Crick

James Watson and Francis Crick

First scientists to create a model of DNA

It is still the model used today

Sides are made of sugar and phosphate molecules

Rungs of the ladder are made of nitrogen bases

Made of 5 elements: carbon, hydrogen, oxygen, nitrogen, and phosphorus

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