the bacteria streptococcus pneumoniae has a virulent s strain and a nonvirulent r strain. the s strain is lethal to mice. the s strain contains a chemical factor that can transform the r strain to be virulent. the diagram shows a series of experiments conducted by injecting combinations of these strains into mice to identify the transforming factor.
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the bacteria streptococcus pneumoniae has a virulent s strain and a nonvirulent r strain. the s stra...
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