lacI–d mutations

a. can inactivate the repressor even if only one of the four subunits is mutant.
b. occur in the region of the gene encoding the inducer binding site.
c. are cis-acting.
d. can only inactivate the repressor if all four subunits are mutant.
e. result in the lac operon being permanently repressed.


Ans: a

Biology & Microbiology

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