Biology 1002B Chapter Notes - Chapter 7: Lac Operon, Lac Repressor, Regulatory Sequence
Document Summary
13. 1 regulation of gene expression in prokaryotic cells: prokaryotic cells typically undergo rapid an reversible alterations in biochemical pathways, allows them to adapt quickly to changes in their environment. 13. 1b the lac operon for lactose metabolism is transcribed when an inducer inactivates a. > rna polymerase can bind to promoter -> transcription occurs. 13. 1c transcription of the lac operon is also controlled by a positive regulatory system. Lactose must be converted into glucose: cap: catabolite activator protein, cap binding site is on he. Dna upstream of the promoter: cap bens the dna to make the promoter more accessible to rna polymerase, transcription, cap is an inactive form, activated with cyclic. 13. 1d transcription of the trp operon genes for tryptophan biosynthesis is repressed when. Inducer (allolactose) present -> binds to repressor -> inactivates it -> operon is transcribe: trp operon. Inactive from: corepressor (tryptophan) present -> binds to repressor -> activates it -> blockers transcription of operon.