ZOL 341 1st Edition Lecture 22 Outline of Last Lecture I Polyploidy II Chromosome alteration III Chromosome translocation Outline of Current Lecture II Lac operon structure III Lac operon structural genes IV Lac I V Lac operon function Current Lecture lac operon structure regulatory protein contains promoter that binds RNA polymerase operator binds lac repressor protein CAP cAMP region structural genes lacZ encodes beta galactosidase lacY encodes permease lacA endodes transacetylase all three are transcribed as a single polycistronic mRNA lacI encodes lac repressor protein is constitutively expressed lac operon function no lactose or presence of glucose lac operon is transcriptionally silent These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute glucose is preferred no beta galactose is produced no allolactose in the cell lac repressor protein binds to lacO prevents transcription inducer allolactose
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