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Gene Regulation: lac operon (lac operon (responsible for the breakdown of…
Gene Regulation: lac operon
types of genes
structural
code for protein product that is NOT involved in the regulation of other genes
regulatory
code for a protein that regulates other genes
needed to conserve energy and resources
operon
a set of structural genes that are transcribed into a single mRNA molecule in bacteria and share a promotor region.
lac operon = 3 structural genes
absence of lactose
repressor binds to OPERATOR, preventing RNA polymerase from binding to the PROMOTER region
lac operon
responsible for the breakdown of lactose when lactose is present in the environment fo the Ecoli bacteria
lactose breakdown = hydrolysis (H2O in)
repressor from regulatory gene binds to the operator
presence of lactose
lactose = inducer molecule
lactose binds to the repressor protein which releases from the operator region. RNA polymerase can then bind to the promoter region therefore transcription and translation can occur
