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
All bacteria evolved from viruses
Parasites have a definite genomic sequence similar to viruses
Mitochondria have evolved from endosymbiotic bacteria

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Microbial Genetics
Why the bacterium Treponema pallidum is difficult to culture?

Because it is unable to use carbohydrates as an energy source
Because it requires extremely low temperature at which water freezes
Because it requires a great deal of water to reproduce
Because it lacks the genes needed for TCA cycle and oxidative phosphorylation

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