Why might it be advantageous for bacteria to prevent transcription of a particular enzyme, unless its substrate is present in the environment?Multiple ChoiceTranscription is the last stage of gene expression and is therefore more easily regulated.Several types of RNA are required for transcription to proceed, and often they are not available.DNA is not used during transcription, and thus avoiding transcription protects the DNA from mutation.The steps involved in synthesizing proteins such as enzymes require a considerable amount of energy.

If E. coli bacteria are grown in the absence of lactoseMultiple Choicethe repressor will not bind the operator, thus allowing transcription of the lac operon genes.the repressor will bind the operator, thus allowing transcription of the lac operon genes.the repressor will not bind the operator, thus preventing transcription of the lac operon genes.the repressor will bind the operator, thus preventing transcription of the lac operon genes.No answer is correct.

The majority of gene expression regulation in bacteria involves modulating which process?Question 18Answera.Translation initiationb.Transcription terminationc.mRNA degradationd.Transcription initiation

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

Which of the following methods are used by eukaryotes to control gene expression but are not used by bacteria?Group of answer choicesregulatory proteins binding to promoter sequences and determining polymerase usedorganization of genes in operonslimiting access to free nucleic acidscontrol of both RNA splicing and chromatin remodeling

If source DNA is extracted from a eukaryotic organism and used to create transgenic bacteria, why will the mRNA transcribed from the recombinant DNA encode a defective protein in the bacteria?Multiple choice question.Eukaryotic DNA contains introns, which bacteria cannot remove.Bacterial DNA only contains introns, and so bacterial enzymes do not recognize the exons present in eukaryotic mRNA.Bacteria do not use the same genetic code as eukaryotes do.Eukaryotic DNA only contains exons, and the mRNA made from it will not be able to be translated by bacterial ribosomes.