Help with these lac operon questions?

Help with these lac operon questions?



Is the lacOc mutation in the lac operon a loss-of-function or gain-of-function mutation? Briefly explain your answer. 

Define cis-regulatory element. Give an example of a cis-regulatory element that functions in the lac operon. 

Define trans-acting factor. Give an example of a trans-acting factor that functions in the lac operon





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