/ Which of the following is a characteristic of positive transcriptional control? A. Soos gevind in die lac operon /Exhibited in the lac operon B. Betrek repressor proteïene / Involve repressor proteins C. Binding van die regulatoriese proteïen inhibeer inisiëring van transkripsie / Binding of the regulatory protein inhibits initiation of transcription D. Binding van die regulerende proteïen bevorder die inisiasie van transkripsie / Binding of the regulatory protein promotes initiation of transcription

Regulatory proteins can control the initiation of transcription by A. Binding van die DNA in 'n aktiewe toestand om transkripsie te inhibeer / Binding the DNA in an active state to inhibit transcription B. Binding van die DNA in die teenwoordigheid van 'n induseerder molekule om transkripsie toe te laat / Binding the DNA in the presence of an inducer molecule to allow transcription C. Bind die DNA om transkripsie te bevorder tensy 'n inhibeerder teenwoordig is / Binding the DNA to promote transcription unless an inhibitor is present D. Al die bogenoemde / All of the above

Regulation of bacterial operons by inducers, e.g. lactose, exhibits which of the following properties?(1) Inducer binds to the repressor and __________(2) Inducer effect on RNA polymerase binding to the promoter: ___________(3) Repressor produced by:Select one:A.(1) Activates the repressor, (2) Enhances, (3) A separate geneB.(1) Inhibits the repressor, (2) No effect, (3) A separate geneC.(1) Inhibits the repressor, (2) Inhibits, (3) Genes of the operonD.(1) Activates the repressor, (2) Inhibits, (3) A separate geneE.(1) Activates the repressor, (2) Enhances, (3) Genes of the operon

Lactose or its analogues act as positive regulators of Lac operon by:Select one:a. Binding to repressor subunits so that the repressor cannot attached to operator locus.b. Attaching to I gene and preventing its expressionc. Attaching to promoter region and facilitating the biding of RNA polymerased. Increasing the synthesis of catabolic gene activator protein.Clear my choice

How does the lac repressor inhibit transcription?Group of answer choicesIt binds to the RNA polymerase and prevents its association to DNA.It binds to DNA and prevents the RNA polymerase from unwinding and transcribing the DNA.It binds to the RNA molecule, preventing ribosomes from binding.All of the aboveNone of the above

Which of the following mechanism(s) control(s) the activity of transcriptional regulators in eukaryotic cells?