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

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

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