It can be said as negative regulation of lac operon, when
(a) Repressor tetramer binds to promoter gene
(b) Allolactose binds to repressor
(c) Inducer binds to repressor
(d) It is regulated by repressor
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Negative Control of the lac Operon
Expression of the lacI gene is not regulated and very low levels of the lac repressor are continuously synthesized. Genes whose expression is not regulated are called constitutive genes.
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