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Which of these items have a positive impact on PEDCBA transcription?

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Which of these items have a positive impact on PEDCBA transcription?

(a) Trp-TRAP

(b) Trp-ANTI TRAP

(c) Anti-Trp with TRAP

(d) Anti-Trp with Trp-TRAP

I had been asked this question in an international level competition.

The origin of the question is Operons : Trp topic in portion Gene Expression : Transcription Prokaryotes of Cytogenetics

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Right answer is (d) Anti-Trp with Trp-TRAP

Explanation: Anti- trp is an auto-regulating molecule that is sensitive to different levels of tryptophan. When tryptophan conc. is high enough to form trp-TRAP complex yet lower than necessary it binds to the Trp-TRAP complex thus preventing repression.

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