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 a great deal of water to reproduce
Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Because it requires extremely low temperature at which water freezes

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Microbial Genetics
Why Deinococcus radiodurans is able to survive massive exposure to radiation?

Because it produces a thick shell which acts as a shield from the radiation
Because it has many copies of genes encoding DNA repair
Because its cellwall contains radioactive elements
Because it has unique DNA repair mechanisms

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