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Question
Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ?
Options:
A .  Parasitic bacteria have very large genomes
B .  Mitochondria have evolved from endosymbiotic bacteria
C .  Parasites have a definite genomic sequence similar to viruses
D .  All bacteria evolved from viruses
Answer: Option B
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