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Discovery: Chargaff's Rules (DNA from any cell of any organism should have a 1:1 ratio of pyrimidine and purine bases; the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine.

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Discovery: A factor in heat-killed, disease- causing bacteria, can turn harmless bacteria into disease causing bacteria.

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Discovery: The nucleic acid DNA stores and transmits the genetic information from one generation of an organism to the next.

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Discovery: DNA is genetic material.

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Discovery: Basic helix structure

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Discovery: DNA double helix