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Which of these Ara genes is a mode of feedback autoregulation?

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Which of these Ara genes is a mode of feedback autoregulation?

(a) Ara A

(b) Ara B

(c) Ara C

(d) Ara D

I had been asked this question in class test.

This intriguing question originated from Operons : Lac and Ara topic in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

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Best answer
The correct choice is (c) Ara C

Best explanation: As ara C level rises it itself binds beside its promoter preventing the RNA polymerase to bind to the same there by having a negative feedback control. Ara BAD promoter lacks this type of control and is regulate din different way.

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