Imagine a bacterial species in which the methionine (Met) operon is regulated only by an attenua Show more Q1. Imagine a bacterial species in which the methionine (Met) operon is regulated only by an attenuator and there is no repressor.
In its mode of operation the methionine attenuator is exactly analogous to the trp attenuator of E. coli. The relevant portion of the attenuator sequence in the RNA is First AUG represents translation start site and the region shown after dots is in correct reading frame. What phenotype [Constitutive (expressed all the time) wild type (with attenuation control for Met synthesis) or Met (irresponsive to methionine concentration)] would you expect for each to the types of mutant RNA below? Explain your reasoning? Show which stem loops will be formed. a) 3 rd undelined A is deleted (shown in red).. b)3rd and 4rd undelined A s are deleted (Shown in red and blue) c) the first three underlined As are deleted . . . . . . Q2. A frameshift mutation occurs near the end of an exon. Does it affect the reading frame of the next exon in the processed mRNA? Explain your answer. Show less
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