The discovery of these structures in C. elegans ended the longstanding belief that they were confined to prokaryotes, and the work of Jacob and Monod found that their function depends on an upstream regulatory gene.
The first complete map of one of these structures was published in 2009 for Listeria, while the activity of another can be detected by a blue color in the presence of X-gal. The discovery of these structures in C. elegans ended the longstanding belief that they were confined to prokaryotes, and the work of Jacob and Monod found that their function depends on an upstream regulatory gene. The sugar arabinose (uh-RAAB-ih-nohs) acts as an inducer for one of these genetic structures, while tryptophan serves as a corepressor for another, preventing the attachment of RNA polymerase (pah-LIH-mur-"ace"). Consisting of structural genes, a promoter, and an operator, name these transcriptional units of the bacterial genome such as E.coli's trp and lac ones.
The first complete map of one of these structures was published in 2009 for Listeria, while the activity of another can be detected by a blue color in the presence of X-gal.
{operon} [do not prompt on “gene”; do not accept more specific answers]