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2012 HOMEWORK_06AB_Questions

Propose a model to explain how sigmal regulates oxya

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Unformatted text preview: are studying how the bacterium, Rhodobacter capsulatus, responds to different oxygen concentrations. You find that the levels of a cytochrome oxidase protein, Oxy ­1, decrease at low oxygen concentration. You further find that the levels of transcription of the gene encoding Oxy ­1, oxyA, are lower at low oxygen concentration (see the graph below). You isolate a mutant of R. capsulatus that is defective in decreasing transcription of oxyA under low oxygen concentration conditions (see graph below). You find that thi...
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