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Discovering DNA as the Hereditary Material

AQA AS-level BiologyNucleic AcidsLesson 7 of 18

Scientists used two strains of a bacterium called the S-strain and the R-strain of a bacterium that causes pneumonia. The R-strain caused pneumonia when injected into mice and the S-strain was a safe strain that did not cause pneumonia.

The scientists injected the mice separately with the live S-strain (safe form) and dead R-strain (harmful form). In both cases the mice remained healthy.

Diagram

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