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zhè shì běn zhōng wén shū (C'est un livre de chinois)
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- You try to generate E. coli mutants by inducing pyrimidine dimers through UV exposure to bacteria on Petri plates. You confirm the formation of pyrimidine dimers because some cells are unable to replicate or undergo transcription. You find, however, when the plates containing the newly exposed bacteria are incubated in your new warm room (which is a big walk-in incubator), very few mutations are created. You are puzzled by this until you look closely at the large sunny window in your new walk-in incubator and you conclude thatan increase in SOS repair has occurred, which has reduced the number of mutations created.the mismatch repair system has been repressed, and this has caused most of the cells to not survive and not form colonies on the plates.base-excision repair has removed all the pyrimidine dimers from the bacteria so that mutations were not created.nucleotide-excision repair has been repressed, whic