BI+107+Chapter+18

BI+107+Chapter+18 - Chapter18 GeneExpression...

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Chapter 18 Gene Expression
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Levels of reguation Regulate the activity of a protein/enzyme  Feedback inhibition is an example of this Regulate the quantity of a protein/enzyme Controlling gene expression (i.e. transcription  and translation) In bacteria, since there is no mRNA processing,  we assume the cell only needs to control  transcription. 
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Fig. 18-2 Regulation of gene expression trpE gene trpD gene trpC gene trpB gene trpA gene (b) Regulation of enzyme production (a) Regulation of enzyme activity Enzyme 1 Enzyme 2 Enzyme 3 Tryptophan Precursor Feedback inhibition
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Gene Regulation What is an operon and why have it in  bacteria? Genes that are constitutively on Example genes for proteins used in glycolysis Genes that are regulated Repressible operons (trp) Inducible operons (lac)
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Fig. 18-3a Polypeptide subunits that make up enzymes for tryptophan synthesis (a) Tryptophan absent, repressor inactive, operon on
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BI+107+Chapter+18 - Chapter18 GeneExpression...

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