C8e_18_Test_Bank

C8e_18_Test_Bank - Biology, 8e (Campbell) Chapter 18...

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Unformatted text preview: Biology, 8e (Campbell) Chapter 18 Regulation of Gene Expression Multiple-Choice Questions 1) What does the operon model attempt to explain? A) the coordinated control of gene expression in bacteria B) bacterial resistance to antibiotics C) how genes move between homologous regions of DNA D) the mechanism of viral attachment to a host cell E) horizontal transmission of plant viruses Answer: A Topic: Concept 18.1 Skill: Knowledge/Comprehension 2) The role of a metabolite that controls a repressible operon is to A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter. B) bind to the operator region and block the attachment of RNA polymerase to the promoter. C) increase the production of inactive repressor proteins. D) bind to the repressor protein and inactivate it. E) bind to the repressor protein and activate it. Answer: E Topic: Concept 18.1 Skill: Knowledge/Comprehension 3) The tryptophan operon is a repressible operon that is A) permanently turned on. B) turned on only when tryptophan is present in the growth medium. C) turned off only when glucose is present in the growth medium. D) turned on only when glucose is present in the growth medium. E) turned off whenever tryptophan is added to the growth medium. Answer: E Topic: Concept 18.1 Skill: Knowledge/Comprehension 4) This protein is produced by a regulatory gene: A) operon B) inducer C) promoter D) repressor E) corepressor Answer: D 1 Topic: Concept 18.1 Skill: Knowledge/Comprehension 5) A mutation in this section of DNA could influence the binding of RNA polymerase to the DNA: A) operon B) inducer C) promoter D) repressor E) corepressor Answer: C Topic: Concept 18.1 Skill: Knowledge/Comprehension 6) A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes: A) operon B) inducer C) promoter D) repressor E) corepressor Answer: E Topic: Concept 18.1 Skill: Knowledge/Comprehension 7) When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator: A) operon B) inducer C) promoter D) repressor E) corepressor Answer: B Topic: Concept 18.1 Skill: Knowledge/Comprehension 8) A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in A) continuous transcription of the structural gene controlled by that regulator. B) complete inhibition of transcription of the structural gene controlled by that regulator. C) irreversible binding of the repressor to the operator. D) inactivation of RNA polymerase by alteration of its active site. E) continuous translation of the mRNA because of alteration of its structure. Answer: A Topic: Concept 18.1 2 Skill: Application/Analysis 9) The lactose operon is likely to be transcribed when A) there is more glucose in the cell than lactose....
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C8e_18_Test_Bank - Biology, 8e (Campbell) Chapter 18...

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