BS 161 1st Edition Lecture 33 Outline of Last Lecture I. Transcription translationOutline of Current Lecture II. Control gene expressionCurrent Lecture-prokaryotes and eukaryotes alter gene expression in response to their changing environment-in multicellular eukaryotes, gene expression regulates development and is responsible for differences in cell types-RNA molecules play many roles in regulating gene expression in eukaryotes-gene regulation can be…-transcriptional-post transcriptional-translational -post translational-transcriptional control: slow but efficient-translational control: allows a cell to change quickly when proteins are produced-post translational control: provides the most rapid response-a cell can regulate the production of enzymes by feedback inhibition or by gene regulation-gene expression in bacteria is controlled by the operon model-operon: the DNA that includes the operator, the promoter, and the genes (called cistrons) they control-repressor: protein that can switch off the operon; prevents gene transcription by binding to the operator and blocking RNA polymerase-corepressor: a molecule that cooperates with a repressor protein to switch an operon off-anabolic pathway: repressible regulation; default=on-catabolic pathway: inducible regulaton;
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