Which segments of the attenuator together form the repression loop?(a) Segment 1-2(b) Segment 2-3(c) Segment 3-4(d) Segment 1-4The question was posed to me during an interview for a job.My question is based upon Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics

Which segments of the attenuator together form the repression loop?(a)

1.	Which segments of the attenuator together form the repression loop?(a) Segment 1-2(b) Segment 2-3(c) Segment 3-4(d) Segment 1-4The question was posed to me during an interview for a job.My question is based upon Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics
Answer» The correct CHOICE is (b) Segment 2-3 For explanation I would say: In the absence of tryptophan when the RNA polymerase stalls at segment 1 of the ATTENUATOR it HINDERS the formation of loop 1-2. The alternate loop so FORMED is loop 2-3 which is the ATTENUATION loop.

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