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Which of the following regulatory sequence allows transcription to continue?

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Which of the following regulatory sequence allows transcription to continue?

(a) Sequence 1

(b) Sequence 2

(c) Sequence 3

(d) Sequence 4

I have been asked this question in class test.

The origin of the question is Regulation of Gene Expression in Prokaryotes topic in chapter Regulation of Gene Expression and Miscellaneous of Biochemistry

1 Answer

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Correct answer is (b) Sequence 2

Explanation: Regulatory sequence 1 is crucial for a tryptophan sensitive mechanism.

Sequence 2 is an alternative complement for sequence 3.

Sequence 4 is for attenuating transcription.

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