Campbell Biology Concepts And Connections 8th Edition By Taylor – Test Bank

Chapter 11 How Genes Are Controlled

11.1 Multiple-Choice Questions

1) The term “gene expression” refers to the
A) fact that each individual of a species has a unique set of genes.
B) fact that individuals of the same species have different phenotypes.
C) process by which genetic information flows from genes to proteins.
D) flow of information from parent to offspring.
Answer: C
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

2) A gene operon consists of
A) a transcribed gene only.
B) a promoter only.
C) a regulatory gene only.
D) transcribed genes, an operator, and a promoter.
Answer: D
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

3) In a prokaryote, a group of genes with related functions, along with their associated control sequences, defines
A) an allele.
B) an operon.
C) a locus.
D) a transposon.
Answer: B
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

4) The lac operon in Escherichia coli
A) prevents lactose-utilizing enzymes from being expressed when lactose is absent from the environment.
B) prevents lactose intolerance.
C) prevents lactose-utilizing enzymes from being expressed when lactose is present in the environment.
D) promotes the expression of lactose-utilizing enzymes when lactose is absent from the environment.
Answer: A
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1
5) Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called
A) regulators.
B) operators.
C) activators.
D) repressors.
Answer: C
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

6) The lac operon of E. coli is ________ when the repressor is bound to lactose.
A) active
B) inactive
C) cloned
D) unregulated
Answer: A
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

7) The expression of the tryptophan operon is controlled by
A) a repressor that is active when it is alone.
B) a repressor that is inactive when it binds to lactose.
C) a repressor that is active when it binds to tryptophan.
D) an activator that turns the operon on by binding to DNA.
Answer: C
Topic: 11.1
Skill: Knowledge/Comprehension
Learning Outcome: 11.1

8) Which of the following is likely to occur in E. coli cells that are grown in skim milk?
A) The lac operon is shut off, and the cells will not produce lactose-utilizing enzymes.
B) The trp repressor is activated, and the cells will produce lactose-utilizing enzymes.
C) The trp operon is turned on, but the bacteria will not produce lactose-utilizing enzymes.
D) The trp operon and the lac operon are both switched off.
Answer: B
Topic: 11.1
Skill: Application/Analysis
Learning Outcome: 11.1
Global LO: 2
9) A single cell, the zygote, can develop into an entirely new organism with many different specialized cells. Which of the following statements about this process is false?
A) Additional genetic information for the formation of specialized cells is passed on to the developing embryo via the mother.
B) The descendant cells specialize by a process known as differentiation.
C) The zygote contains all of the genetic information required for the development of many different cell types.
D) Differentiation of the zygote into a multicellular organism results from selective gene expression.
Answer: A
Topic: 11.2
Skill: Knowledge/Comprehension
Learning Outcome: 11.2

10) The basis of cellular differentiation is
A) the operon.
B) selective gene expression.
C) cloning.
D) mutation.
Answer: B
Topic: 11.2
Skill: Knowledge/Comprehension
Learning Outcome: 11.2