How does the lac repressor inhibit transcription? Group of answer choices It binds to the RNA polymerase and prevents its association to the DNA.It binds to RNA polymerase and causes a frame shift, thus producing an mRNA with a nonsense mutation.It binds to the DNA and prevents the RNA polymerase from unwinding and transcribing the DNA.It binds to the mRNA molecule, preventing ribosomes from binding.None of the answers is correct.

How does the lac repressor inhibit transcription?

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

When RNA polymerase is bound to the lac promoter sequence, transcription of the lac operon is on.

How is translation initiated?Group of answer choicesTwo ribosomal subunits bind to the mRNA transcript.DNA helicase binds to the origins of replication.RNA polymerase binds to the promoter sequence.Two ribosomal subunits bind to the DNA sequence.

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