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

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

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

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

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