Biology 1002B Lecture Notes - Chromosome, Allolactose, Lac Operon
15 Mar 2013
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Document Summary
14. 1: regulation of gene expression in prokaryotic cells. Proks tend to be single-celled, relatively simple, with generation times measured in minutes. Prok cells undergo rapid and reversible alteration in biochemical pathways that allows them to adapt quickly to changes in their environment. The operon is a unit of transcription. A cluster of prok genes and the dna sequence involved in their regulation. Brings multiple genes under the control of a single operator. The promoter is a region where the rna pol beings transcription. The operator is a binding sequence for a regulatory pn, A gene that is separate from the operon encodes the regulatory pn. Repressors, regulatory pns, bind to the dna and reduce the likelihood that genes will get transcribed. Activators, regulatory pns, bind to the dna and increase the likelihood that genes will get transcribed. Many operons are controlled by more than one regulatory mechanism.
