CAS BI 203 Lecture Notes - Lecture 7: Lac Repressor, Lac Operon, Repressor

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[00:00:00. 76] dr. martin steffen: ok, resuming 2940 our discussion about complex gene. 2941 regulation-- now, in this slide, we"re going to see how the cell controls sugar metabolism. 2942 particular, we"re going to look how it regulates the gene expression based on the presence of two. 2943 sugars-- glucose, which is its preferred sugar source, or lactose. 2944 [00:00:28. 69] it can use lactose to grow. But it only likes to do so when no glucose is present. 2945 because it"s a less efficient sugar to be used. The genes we"re going to turn on or off is the lac. Plus, there are about three other lac genes at this operon. 2947 [00:00:50. 86] and we have two proteins that are going to be involved-- a repressor and an. 2948 activator, which will bind depending on whether glucose or lactose are present. The blue protein binds and responds to a molecule called. 2950 cyclic amp, which is related to the glucose concentration.

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