In prokaryotes, structural genes of related function are often organized together on the genome and transcribed together under the control of a single promoter; https://cnx.org/contents/5CvTdmJL@6.1:LeWYNHAi@4/11-7-Gene-Regulation-Operon-Theory#OSC_Microbio_11_07_Operon; Download for free at http://cnx.org/contents/e42bd376-624b-4c0f-972f-e0c57998e765@6.1.Creative Commons Attribution License 4.0 license.
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The five structural genes needed to synthesize tryptophan in E. coli are located next to each other in the trp operon. When
The three structural genes that are needed to degrade lactose in E. coli are located next to each other in the lac operon. When...
(a) In the presence of cAMP, CAP binds to the promoters of operons, like the lac operon, that encode genes for enzymes for the use of alternate substrates. (b) For the lac operon to be expressed, there must be activation by cAMP-CAP as well as removal of the lac repressor from the operator.
When tryptophan is plentiful...
Riboswitches found within prokaryotic mRNA molecules can bind to small intracellular molecules, stabilizing certain RNA structures....
In eukaryotes, an enhancer is a DNA sequence that promotes transcription....
