The tryptophan operon is a repressible operon that is only permanently turned off when glucose is available in the growth medium.
- In the field of genetics, an operon is a functional piece of DNA that houses a collection of genes that are all regulated by the same promoter.
- The genes are combined during transcription into a single strand of messenger RNA (mRNA), which is then either translated simultaneously in the cytoplasm or split into monocistronic mRNAs, which are translated independently and consist of multiple strands of mRNA that each encode a single gene product. This has the effect of either causing the operon's genes to express themselves simultaneously or not at all. To define an operon, several genes must co-transcribe.
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