Regarding operons, which statement is FALSE? Operons allow a related set of genes to be controlled together The genes in a repressible operon are usually "off", but can be turned "on" if conditions require Operons are common in bacteria The default state of an inducible operon is "off"
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Which of the following statements about gene regulation concerning operons is INCORRECT? A. Presence of operons where genes of related functions are clustered is common in bacteria but not in eukaryotes. B. For a gene under positive repressible control, the normal state is transcription of a gene, stimulated by a transcriptional activator. C. For a gene under negative repressible control, a small molecule is required to prevent the gene’s repressor from binding to DNA. D. A negative repressible gene is controlled by a regulatory protein that inhibits transcription. E. A regulator gene has its own promoter and is transcribed into an independent mRNA.
Nicole L.
46. All of the following are true related to an inducible operon EXCEPT: a. A regulatory gene codes for repressor protein b. When induce is absent; no mRNA is synthesized When mRNA is made, structural genes are transcribed so enzyme synthesis is induced d. There is no operator Inducer binds to repressor 47. All of the following is are true related to a repressible operon system EXCEPT: a,A regulatory gene codes for repressor protein Corepressor controls enzyme synthesis Corepressor binds to repressor; activated repressor binds operator; preventing transcription Repressor binds corepressor Inducer binds to repressor
Madhur L.
Which of the following statements about operons is FALSE? a) Only found in prokaryotes b) A group of genes with related functions controlled as one unit c) Excess product will result in the operon being turned off d) Excess reactants/substrate will result in the operon being turned off e) Consists of a promoter, operator, and regulator
Shaiju T.
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