Q. If a bacteria is facing lack of carbon sources in the media, which sigma factor concentration is expected to increase?

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Q. You want your bacterial culture to grow well so you made an enriched media with all forms of carbohydrates. Which of this carbohydrate should you restore first if you want the culture to keep growing at the same rate?

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Q. In a mero-diploid you have one I- and one I+ Repressor gene in the two lac operons. I+ is wild type while I- is a mutant which produces a repressor that doesn’t bind. What would be the functionality of the diploid?

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Q. Which of these Lac operon mero- diploid will be constitutively turned on? Considering the terms has their usual meaning.

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Q. Which of these combinations will result is am operon that can never produce beta galactosidse?

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Q. Which of the Ars operon regulation site is actually preventing RNA polymerase from binding and producing the Ara genes BAD?

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

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Q. In which of this condition is Ara operon functional?

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Q. Which of the Ara promoter regulation is controlled by binding of repressors on the O1 regulating unit?

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Q. Which of these operons is anabolic?

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

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Q. A Lac repressor is a tetramer repressed when bound to the inducer. The trp repressor is a ____________________

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Q. Which of these properties do not agree with trp operon attenuator?

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Q. Which segments of the attenuator together form the repression loop?

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Q. We know that lactose has a positive impact on the activity of the lac operon. Tryptophan’s presence has a ________________

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Q. If in an experiment you mutate the two trp codons in the attenuator to ala codon what will be the impact on repression?

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Q. Which of these items have a positive impact on PEDCBA transcription?

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Q. When uncharged tRNA concentration is low what will you expect as the activity of tryptophan operon?

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

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Q. Which of this mode of trp regulation is not possible in eukaryotes?

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