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

DNA microarrays
northern blot
cloning library
southern blot

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

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

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