Chapter 18 has been totally reorganized and so has its Test Bank. The earlier edition questions were transferred from several Biology, Seventh Edition,
... [Show More] chapters, and 30 questions are entirely new. Several sections of the new Chapter 18 had no or almost no corresponding questions. Likewise, none of the earlier questions required higher level thinking and learning skills, so nearly all of the new questions are at Application/Analysis and Synthesis/Evaluation skill levels.
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
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 [Show Less]