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Which of the Ara promoter regulation is controlled by binding of repressors on the O1 regulating unit?(a) P^A(b) P^B(c) P^C(d) P^DI got this question in my homework.The origin of the question is Operons : Lac and Ara topic in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer»

The correct option is (c) P^C

To explain I WOULD say: When ARA C is produced in EXCESS it bind to O1 and represses the promoter PC. This is true as o1 LIES closer to PC. However the other promoter P^BAD has a REGULATING unit O2 that acts from a distance by looping out.



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