Chapter 18 regulation of gene expression HELPFUL PDF

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BIOLOGY GEENE EXPRESSION NOTES SUPER SHORT BUT HAS VISUALS BIOLOGY GEENE EXPRESSION NOTES SUPER SHORT BUT HAS VISUALS BIOLOGY GEENE EXPRESSION NOTES SUPER SHORT BUT HAS VISUALS...

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Chapter 18: Regulation of Gene Expression Prokaryotes & Eukaryotes ● uses environmental conditions to regulate gene expression Multicellular eukaryotes ● gene expressions regulates development RNA molecules ● Has a role in eukaryotic gene expression Concept 18.1: Bacteria often respond to environmental change by regulating transcription Natural selection ● Favored bacteria that can only produce the gene products needed by that cell ● Cell can regulate the production of enzymes by ○ Feedback inhibition ○ Gene regulation ● Operon model ○ Mechanism for gene expression control in bacteria Regulation of Metabolic Pathway

In eukaryotes, gene expression is controlled Operon- entire sequence of DNA, promoter, operator, and genes within the pathway ● All genes within a metabolic pathway are located next to one another ● Promoter and operator regions that can be turned on and of

trp ● ● ●

operon Bacteria have a metabolic pathway regulating tryptophan (amino acid) production 5 genes are translated into proteins which act as enzymes for tryptophan synthesis Promoter, operator, and genes are collectively called the trp operon

•What could you do to the operator to turn on or of the trp genes? Turning of prevents unnecessary biosynthetic enzymes from being produced Turning on is when the operon is binded to the repressor molecules which changes the shape...