You wish to isolate lac mutants of E

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You wish to isolate lac mutants of E. coli. After mutagenesis, mutants that DO NOT express any beta-gal in inducing medium, are candidates for loss of function at: (choose the answer with all and only the pertinent loci)

Note. For this answer, let's use the recent and strict book definition of P (binds RNA pol) and O (binds lacI product) sites, not the encompassing definition originally used originally by Jacob and Monod.

a) O, Y

b) I, O

c) Z, O

d) A, Y, O

e) Z, P