BIO 202 Chapter Notes - Chapter 18: Trp Operon, Lac Operon, Adenylyl Cyclase

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Prokaryotes: bacteria make their own amino acids from scratch. However, if they can find it in their environment or made enough to get by, they stop making them: an example of this is tryptophan (an amino acid that bacteria make themselves. You start with a precursor molecule, which then are converted by a few intermediate steps to the final molecule of tryptophan. To make tryptophan, it needs to make a number of enzymes, which are products of individual genes. That makes to make tryptophan, it needs to turn on these genes to make the enzymes that can catalyze the production of tryptophan from a precursor. The production of tryptophan can be regulated in two different ways. The level of gene expression: another example of this is when glucose runs out and the cell has to find another way to produce atp.

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