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

/ 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

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

Transcription begins when the enzyme binds to the1 pointterminator on DNAinitiator on DNApromoter on DNApromoter on RNAA "stop" signal at the end of a gene that causes the completed mRNA to drop off the gene.1 pointterminator on DNAinitiator on DNApromoter on DNAterminator on RNA

Initiation of transcription occurs at:Group of answer choicesThe initiator region called the Shine-Dalgarno sequenceSpecific sequences called promotersSites called origin of replicationRandom points in a DNA molecule

The promoter: A) Is an RNA sequence necessary for activating the transcription of a gene B) Is an RNA sequence necessary for activating translation C) Is a DNA sequence necessary for regulating the transcription of a gene D) Is the site of initiation of gene transcription E) Is a protein factor necessary for activating gene transcription