Microbial Genetics
In the time since E. coli and Salmonella diverged evolutionarily

none of these
there has been little change in either genome
E. coli has acquired many genes via horizontal transfer
E, coli has lost approximately 50% of its genome

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Microbial Genetics
Why Deinococcus radiodurans is able to survive massive exposure to radiation?

Because its cellwall contains radioactive elements
Because it produces a thick shell which acts as a shield from the radiation
Because it has unique DNA repair mechanisms
Because it has many copies of genes encoding DNA repair

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