(Solved): Which of the following mutations in the lac operon will stop E.coli cells from being able to metabo ...

Which of the following mutations in the lac operon will stop E.coli cells from being able to metabolise lactose? i. A disabling mutation in lacZ, the \( \beta \)-galactosidase gene. ii. A mutation in lacl, so the protein it codes for cannot bind to the operator, but otherwise it functions normally. iii. A mutation in the operator, which results in it being unable to bind to the repressor. iv. A mutation in lacl, so the protein it codes for cannot bind to the inducer, but otherwise it functions normally. Which of the options are CORRECT? Select one alternative: ii \& iii only iv only i \& iv only i only