Which of the following is the most likely result of a mutation in the lac operator that prevents release of the depressor protein?Choose 1 answer:(A)The lactose permease protein will be produced, even in the absence of lactose.(B) Transcription of the structural genes will be blocked, even in the presence of lactose.(C) The catabolite activator protein will be bound to the CAP site, even in the presence of glucose.(D) Expression of the lacI gene will be repressed, even in the absence of glucose. The lac operon in E. coli is a coordinately controlled set of genes required for lactose metabolism. Theoperon and its associated regulatory sequences are shown in the following diagram.Structural genesPromoter laclCAP site Promoter OperatorlacZlacYlacAThe function of each locus shown in the diagram is listed in the table below.PartFunctionPromoterBinding site for RNA polymeraselaclGene encoding the lac repressor proteinCAP siteBinding site for the catabolite activator proteinOperatorBinding site for the lac repressor proteinlacZGene encoding the beta-galactosidase proteinlacYGene encoding the lactose permease proteinlacAGene encoding the galactoside transacetylase proteinThe activity of the lac operon is influenced by the availability of lactose and glucose in the cellularenvironment. In the presence of lactose, the lac repressor protein is released from the operator, whichallows the structural genes to be transcribed at a low level. If glucose (the preferred carbon source) isabsent during this time, the catabolite activator protein binds to the CAP site, causing the structural genesto be transcribed at a higher level.

Name: Which of the following is the most likely result of a mutation in the
Uploaded: 2024-03-20T06:42:41.000Z
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Description: Which of the following is the most likely result of a mutation in the lac operator that prevents release of the depressor protein?Choose 1 answer:(A)The lactose permease protein will be produced, even in the absence of lactose.(B) Transcription of th