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Some strains of bacterium streptococcus pyogenes secrete poisonous substances called exotoxins. the genes encoding the exotoxins are thought to have originated in bacteriophages, which are viruses that
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Some strains of bacterium streptococcus pyogenes secrete poisonous substances called exotoxins. the genes encoding the exotoxins are thought to have originated in bacteriophages, which are viruses that infect bacteria

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The most likely mechanism by which the S. pyogenes acquired the ability to produce the extoxins : Bacteriophage DNA became integrated in the bacterial chromosome.
User Taskinoor
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