a. Jack creates an E. coli that has a duplication of the trpR gene, but in one copy he replaces the trpR open reading frame with that of cI. What is the most likely outcome of an infection of this strain with a λ phage with genotype OR1- OR2-, on a medium with no tryptophan?
b. We learned that lac operon regulation was an "all or none" phenomenon because it was either induced or repressed. Which of the operons arabinose, tryptophan, or λ lifecycle would not be "all or none" and why?
