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ch18practice - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What does the operon model attempt to explain? 1) A) horizontal transmission of plant viruses B) how genes move between homologous regions of DNA C) the mechanism of viral attachment to a host cell D) bacterial resistance to antibiotics E) the coordinated control of gene expression in bacteria 2) The role of a metabolite that controls a repressible operon is to 2) A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter. B) bind to the repressor protein and inactivate it. C) bind to the operator region and block the attachment of RNA polymerase to the promoter. D) bind to the repressor protein and activate it. E) increase the production of inactive repressor proteins. 3) The tryptophan operon is a repressible operon that is 3) 4) This protein is produced by a regulatory gene: 4) 5) A mutation in this section of DNA could influence the binding of RNA polymerase to the DNA: 5) 6) A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes: 6) A) corepressor B) inducer C) repressor D) operon E) promoter 1
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7) When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator: 7) 8) A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in 8) A) continuous transcription of the structural gene controlled by that regulator. B) irreversible binding of the repressor to the operator. C) complete inhibition of transcription of the structural gene controlled by that regulator. D) continuous translation of the mRNA because of alteration of its structure. E) inactivation of RNA polymerase by alteration of its active site. 9) The lactose operon is likely to be transcribed when 9)
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