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How many stem loop structures play important role in complete system of tryptophan gene regulation?

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How many stem loop structures play important role in complete system of tryptophan gene regulation?

(a) 3

(b) 4

(c) 6

(d) 8

I got this question during an online interview.

My question is taken from Operons : Trp in portion Gene Expression : Transcription Prokaryotes of Cytogenetics

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Best answer
Right option is (c) 6

The explanation: 3 stem loop for the attenuation and termination in trp gene itself and another 3 for attenuation and termination of anti-trp gene. Overall there are 6 stem loop structures which regulate the entire functioning.

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