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Which segments of the attenuator together form the repression loop?

Which segments of the attenuator together form the repression loop? Correct Answer Segment 2-3

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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