Microbial Genetics
The physical nature of genomes is studied under

functional genomics
proteo genomics
comparative genomics
structural genomics

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

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

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