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

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
none of these

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

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
Because its cellwall contains radioactive elements

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