Toxins like α-amanitin are used for research in much the same way as null mutants−to disrupt a process and see what happens when it no longer works. researchers examined the ability of α-amanitin to inhibit different rna polymerases. they purified rna polymerases i, ii, and iii from rat liver, incubated the enzymes with different concentrations of α-amanitin, and then tested their activity. the results of this experiment are shown below. these findings suggest that α-amanitin-treated cells will have reduced levels