Most also have regulatory genes which code for an activator or repressor that controls mRNA transcription.
Its positive or negative nature is determined by whether an activator or repressor is involved, while its repressible or inducible nature is determined by its normal functional status. They are primarily found in prokaryotes to regulate the production of polycistronic mRNA and components include a structural gene and a promoter site for RNA polymerase attachment. Most also have regulatory genes which code for an activator or repressor that controls mRNA transcription. FTP, name this functional unit discovered by Jacob and Monod, the most common ones being the trp and lac varieties.
Its positive or negative nature is determined by whether an activator or repressor is involved, while its repressible or inducible nature is determined by its normal functional status.
{operon}