Microbial Genetics
The word, used for the small solid supports onto which are spotted hundreds of thousands of tiny drops of DNA that can be used to screen gene expression, is

northern blot
southern blot
DNA microarrays
cloning library

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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 unique DNA repair mechanisms
Because it has many copies of genes encoding DNA repair
Because its cellwall contains radioactive elements

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

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

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

Because it requires extremely low temperature at which water freezes
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

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