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

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

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Microbial Genetics
Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ?

Parasites have a definite genomic sequence similar to viruses
All bacteria evolved from viruses
Parasitic bacteria have very large genomes
Mitochondria have evolved from endosymbiotic bacteria

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