When referring to attenuation in regulation of the trp operon,it would be safe to say that when there are high levels of tryptophan available to the organism,________.
A) the trp operon is being transcribed at relatively high levels
B) translational termination is likely
C) transcriptional termination is likely
D) tryptophan is inactivating the repressor protein
E) ribosomes are stalling during translation of the attenuator region

Question

Quizplus · Accepted Answer

When there are high levels of tryptophan available to the organism, it leads to the formation of charged tRNA for tryptophan, which in turn causes ribosomes to quickly move past the attenuator region. As a result, the 3-4 stem-loop structure of the attenuator region in the trp operon forms, and this generally leads to transcriptional termination. So, high levels of tryptophan tend to prevent transcription of the trp operon by causing attenuation.

When Referring to Attenuation in Regulation of the Trp Operon,it