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Experimental demonstration that DNA is the genetic material

Two closely related strains of the bacterium Streptococcus pneumoniae differ from each other both in their appearance under the microscope and in their pathogenicity. One strain appears smooth (S) and causes death when injected into mice, and the other appears rough (R) and is nonlethal. The experiment in (A) shows that a substance present in the S strain can change (or transform) the R strain into the S strain and that this change is inherited by subsequent generations of bacteria. The experiment in (B) identifies the substance as DNA.

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Resource Type: Diagram
Audience Level: High school upper division 11-12, Undergraduate lower division 13-14, Undergraduate upper division 15-16

Author and Copyright

Authors and Editors: Garland Publishing, Bruce Alberts, Dennis Bray, , Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter
Publisher: Garland Publishing
Format: text/html
Copyright and other restrictions: Yes
Cost: Yes


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