Promoter Operator Repressor protein No transcription The above diagram shows an operon which is activated when a substrate molecule binds to the repressor causing a conformational change that subsequently dislodges the repressor from the operator site allowing transcription to occur. Describe this type of regulatory control. negative control of a repressible gene positive control of a repressible gene negative control of an inducible gene none of the above positive control of an inducible gene
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The repressor protein is bound to the operator, preventing transcription. Show more…
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Match the following: Negative control of transcription multiple genes under the control of the same promoter Positive control of gene transcription regulatory molecule that negatively regulates operon expression in the absence of the inducer Operon regulatory molecule that activates gene or operon expression when it is present in the cell D. regulatory protein binds to DNA and blocks transcription E. regulatory protein binds to DNA and triggers transcription Inducer Repressor
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When a structural gene is under negative inducible control, what would be the result of a mutation that eliminates the repressor protein? a) The structural gene will be constitutively expressed due to the lack of negative inducible control. b) The transcription of the structural gene will not be affected, as a repressor is not required. c) The mutation will lead to activation of an activator upon the lack of a repressor protein, which will allow the transcription to continue. d) As the transcription will require a repressor protein, the transcription will be turned off. e) More cAMP will be produced in a cell to compensate for the lack of a repressor protein.
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