Biology 1002B Lecture Notes - Lecture 15: Trp Operon, Start Codon, Repressor
19 Oct 2018
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The one on the left is the oldest polymerase, as soon as the first bit of message, the ribosome can jump on that and begin to translate. Therefor a has been translated the longest, going from the end to the top. Ribosomes are moving up the picture, polymerases are going right to left. Operons bring several genes under the control of one promoter. If you need one gene product, you might need 3 or 4, so why not put them under the control of the same promoter instead of each gene having its own promoter. Start codon at the beginning of this, then at the end there will be a stop, for all of those genes along the way. You could regulate the activity of this promoter with another sequence called an operator. It is a protein binding domain, it is understood as double stranded dna.
