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Regulator gene

Pearson Ch. 18 - Regulation of Gene Expression

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Ch 18 - Regulation of Gene Expression Overview: Conducting the Genetic Orchestra 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 Concept 18.1: Bacteria often respond to environmental change by regulating transcription metabolic control occurs on two levels cells can adjust the activity of enzymes already present feedback inhibition - presence of enzyme a shuts down synthesis of more enzyme a by inhibiting activity cells can regulate the expression of the genes encoding the enzymes Operons: The Basic Concept

ap_bio_chap_15_gene_regulation.ppt

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0 15 Regulation of Gene Expression Overview: Differential Expression of Genes Prokaryotes and eukaryotes alter gene expression in response to their changing environment Multicellular eukaryotes also develop and maintain multiple cell types Gene expression is often regulated at the transcription stage, but control at other stages is important, too Concept 15.1: Bacteria often respond to environmental change by regulating transcription Natural selection has favored bacteria that produce only the gene products needed by the cell A cell can regulate the production of enzymes by feedback inhibition or by gene regulation Gene expression in bacteria is controlled by a mechanism described as the operon model Regulation of gene expression Precursor trpE gene (a) Regulation of enzyme

AP Biology Chapter 18 Notes Campbell/Reece

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Chapter 18 Regulation of Gene Expression Conducting the Genetic Orchestra Cells precisely regulate their gene expression. Both prokaryotes and eukaryotes must alter thaier patterns of gene expression in response to changes in the environment. Remember, each cell contains the same genetic information, but the liver cell and brain cell express very different proteins, etc. This chapter will look at how cells (bacteria, eukayotes, etc.) regulate expression of their genes. Point: in eukaryotes, the expression of a gene is often regulated at the level of transcription. Learn this. Point: disruptions in gene regulation can lead to cancer 18.1 Bacteria often respond to environmental change by regulating Transcription
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