How is gene expression regulated in prokaryotes?• Ex. The operon–unique toprokaryotes·set of functionallyrelated genes (+ promoter and operator) whose expression is regulated as oneWhat are the standard components of an operon?1) operator–sequence of DNAalong operon where regulatory protein binds to control transcription of operon genes· operator is NOT a gene; is a regulatory protein binding siteEx. Lac operon· gene for regulatory protein that binds at operator NOT part of operonFigure 15.10Part of bacterial chromosome
Repeat•Some genes are part of an operon– Lactose operon– Trypophan operon•Other are like human genes where one promoter helps make one gene product.
This preview has intentionally blurred sections.
Sign up to view the full version.
What are the standard components of an operon?2) promotor –DNA regionto which RNA polymerase binds.· promotoris NOT a gene; is a binding siteEx. Lac operon·Test yourself:What does RNA polymerase do??3) structural genes – DNA that codes for proteins whose expression regulated via operon. How many genes in lac operon? Where are they located with respect to the operator and promotor?Figure 15.10Part of bacterial chromosome