Which of these systems give the best mode for turning trp operon off?(a) Repressor(b) Attenuator(c) Repressor with a downstream poly A tail(d) Repressor with an attenuatorI had been asked this question in unit test.Asked question is from Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics

Which of these systems give the best mode for turning trp operon off?(

1.	Which of these systems give the best mode for turning trp operon off?(a) Repressor(b) Attenuator(c) Repressor with a downstream poly A tail(d) Repressor with an attenuatorI had been asked this question in unit test.Asked question is from Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics
Answer» Right answer is (d) Repressor with an attenuator To explain: A repressor provides 70 fold lowering of expression while an attenuator PROVIDED an additional 10 fold lowering of expression. TOGETHER they have a net effect of 700 fold repression over the trp operon.

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