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To begin transcribing a gene, RNA polymerase binds to the DNA of the gene at a region called the promoter. Basically, the promoter tells the polymerase where to “sit down” on the DNA and begin transcribing. Does RNA polymerase bind to promoter or operator? The promoter is the binding siteRead More →

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The trp operon is a repressible system; this operon is always expressed unless tryptophan, the corepressor, becomes available in the cell. When tryptophan is present, it represses the expression of genes in this operon. This difference between inducible and repressible systems is small, but significant. Is trp operon positive orRead More →