| Front | Draw a lac operon and describe the prokaryotic example of gene expression that Jacob and Monod used to propose the theory of genes being able to be switched on and off |
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| Back | E.coli produce the hydrolitic enzyme that breaks down lactase beta-galactosidase only when lactose is present in surrounding medium. This is because the gene is switched off usually as a repress or molecule binds to the operator gene so RNA polymerase can't bind to the promoter region so mRNA for that enzyme can't be formed; the gene is switched on when lactose binds to repress or molecule which can't bind to operator gene so RNA polymerase can bind to promoter region so gene can be transcribed into mRNA which can be translated into the enzyme so that the gene is expressed |
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