What is a prokaryotic operon? A group of proteins that operate in the nucleus A sequence of DNA that operates during cell division A group of genes randomly located in the bacterial chromosome A group of genes that are transcribed under different promoters A group of genes transcribed from a single promoter involved in the same metabolic pathway

What is the relationship between a gene and an operon?Group of answer choicesAn operon is a group of bacterial genes that share a common promoterAn operon is a bacterial gene that must have activation and repressionEvery bacterial gene is part of an operonAn operon is any bacterial gene

An operon is a cluster of co-ordinately regulated genes. It includes structural genes (enzymes), regulatory genes (activators or repressors), and regulatory sites such as promoters and operators. Consider the following situation of operon.Regulatory element is present ----------- Operon ONMutation of Regulatory gene to lose function -------------- Operon OFFWhich of the following given statements is correct regarding this type of regulation? Genes in this operon are expressed unless they are switched off by a repressor protein The inactivation of the repressor shall lead to the turning on of the operon The absence of positive regulatory protein shall lead to turn off of the operon The inactivation of the repressor shall lead to the turning off of the operon

The lac operon in E. coli is a coordinately controlled set of genes required for lactose metabolism. The operon and its associated regulatory sequences are shown in the following diagram.Two parallel horizontal lines are shown with a break between the first segment and the second segment. The first segment has a box labeled promoter and a box labeled lacI followed by an unlabeled black box. The second segment begins with an unlabeled black box, followed by a box labeled CAP site, a box labeled promoter, a box labeled operator and then 3 boxes with a bracket above them with the caption structural genes. The 3 boxes are labeled lacZ, lacY and lacA.The function of each locus shown in the diagram is listed in the table below.Part FunctionPromoter Binding site for RNA polymeraselacI Gene encoding the lac repressor proteinCAP site Binding site for the catabolite activator proteinOperator Binding site for the lac repressor proteinlacZ Gene encoding the beta-galactosidase proteinlacY Gene encoding the lactose permease proteinlacA Gene encoding the galactoside transacetylase proteinThe activity of the lac operon is influenced by the availability of lactose and glucose in the cellular environment. In the presence of lactose, the lac repressor protein is released from the operator, which allows the structural genes to be transcribed at a low level. If glucose (the preferred carbon source) is absent during this time, the catabolite activator protein binds to the CAP site, causing the structural genes to be transcribed at a higher level.Which of the following is the most likely result of a mutation in the lac repressor protein that prevents binding to the operator?Choose 1 answer:Choose 1 answer:(Choice A, Checked)   The catabolite activator protein will not bind to the CAP site, even in the absence of glucose.AThe catabolite activator protein will not bind to the CAP site, even in the absence of glucose.(Choice B)   The lacI gene will be highly expressed, even in the presence of glucose.BThe lacI gene will be highly expressed, even in the presence of glucose.(Choice C)   The structural genes will not be transcribed, even in the presence of lactose.CThe structural genes will not be transcribed, even in the presence of lactose.(Choice D)   The lactose permease protein will be produced, even in the absence of lactose.DThe lactose permease protein will be produced, even in the absence of lactose.

What is the operator? A cis-regulatory DNA sequence in prokaryotes located within or nearby the gene promoter A DNA sequence that regulates the termination of transcription A gene in the bacterial genome only located at the origin of replication A DNA sequence that regulates the transport of DNA out of the bacterial nucleus The site of initiation of translation

/ A group of structural genes with a single promoter, operator and terminator, is called A. 'n Regulon / A regulon B. 'n Operon / An operon C. 'n Repressor / A repressor D. 'n Induseerder / An inducerReset Selection