What term describes a second level of regulation of the trp operon that occurs in TrpR^- mutants suggesting that it is repressor independent?

Question

Quizplus · Accepted Answer

The second level of regulation described here involves attenuation, which is a regulatory mechanism in which the rate of transcription of a gene is controlled by the level of a particular metabolite or signal. Attenuation is distinct from repression, which involves the binding of a repressor protein to a specific sequence in the DNA to prevent transcription. In this case, the TrpR^- mutants are able to regulate the trp operon even in the absence of the repressor protein, suggesting that the regulation is occurring through attenuation. Modulation, amplification, and desensitization would not be appropriate terms to describe this regulatory mechanism, and derepression only partially describes the process.

What Term Describes a Second Level of Regulation of the Trp