The gene encoding the beta subunit of RNA polymerase from Escherichia coli is said to be orthologous to the rpoB gene of Bacillus subtilis. What does that mean about the relationship between the two genes? What protein do you suppose the rpoB gene of B. subtilis encodes? The genes for the different sigma factors of E. coli are paralogous. What does that say about the relationship among these genes?
Answer to relevant QuestionsDescribe the proteins produced when cells of Escherichia coli experience a heat shock. Of what value are they to the cell? What are the two points at which the amount of protein synthesis can be regulated? What would happen to regulation from a promoter under negative control if the region where the regulatory protein binds was deleted? What if the promoter was under positive control? Describe the types of genomes found in bacterial viruses. Give an example of one virus for each type of genome. What causes the viral plaques that appear on a bacterial lawn to stop growing larger?
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