Microbial Genetics
In the time since E. coli and Salmonella diverged evolutionarily

E. coli has acquired many genes via horizontal transfer
there has been little change in either genome
none of these
E, coli has lost approximately 50% of its genome

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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 lacks the genes needed for TCA cycle and oxidative phosphorylation
Because it requires a great deal of water to reproduce

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

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

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Microbial Genetics
Proteomics is

the study of formation of lipo-protein in animals
the study of the entire collection of proteins expressed by an organism
the study of algal genomes
a branch of quantum physics dealing with proteins

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