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Lac operon
Some genes are transcribed and translated all the time, e.g. genes for constitutive
enzymes. Other enzymes are produced only when they're required; these are inducible
enzymes. One of these inducible enzymes is -galactosidase, which hydrolyses lactose in
the bacterium Escherichia coli (E.Coli)

The operon consists of:

A promoter…

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An operon is a length of DNA, made up of structural genes and control

The operator and promoter regions are both genes however they do
not code for polypeptides.


Component Function

Structural Genes Codes for lac enzymes

Regulator Gene Produces repressor proteins

Promoter Binds to RNA polymerase



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