Answer: C
Evidence suggests that factors that contribute towards the virulence of E. coli strain O157:H7 a bacterial strain reported to cause several food poisoning deaths are caused by genes from a virus that infects bacteria. Considering this evidence which of the following statements most likely explains how the O157:H7 population acquired the genetic variation that distinguishes the strain from harmless E. coli strains such as those that reside in our intestines?A) The virus entered the bacterial cell and incorporated its...

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