Microbial Genetics
The flow of genetic material in microbial cells usually takes place from

none of these
proteins through RNA to DNA
RNA through DNA to proteins
DNA through RNA to proteins

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

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

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