Question 1

Suppose the lacI repressor gene is permanently silenced by a mutation. What would be the impact on the function of the lac operon?

Accepted Answer

A) There would be no real impact on lac operon expression. 
B) The lac operon would be transcribed, but at a high level. 
C) The lac operon would be expressed only when lactose was present. 
D) The lac operon would be transcribed, but at a low level. 
A) There would be no real impact on lac operon expression. 
B) The lac operon would be transcribed, but at a high level. 
C) The lac operon would be expressed only when lactose was present. 
D) The lac operon would be transcribed, but at a low level. B

Question 2

Match each term with its definition.
-benign

Accepted Answer

A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter J

Question 3

How are the vast majority of proteins expressed early in an animal's development?

Accepted Answer

A) They are translated from pre-existing mRNAs present in the unfertilized egg. 
B) They are translated from pre-existing mRNAs delivered by the sperm that fertilized an egg. 
C) They are transcribed and translated from the unfertilized egg's DNA post-fertilization. 
D) They are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. 
A) They are translated from pre-existing mRNAs present in the unfertilized egg. 
B) They are translated from pre-existing mRNAs delivered by the sperm that fertilized an egg. 
C) They are transcribed and translated from the unfertilized egg's DNA post-fertilization. 
D) They are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. A

Question 4

Which of the following determines the rate at which proteins are made?

Accepted Answer

A) translational regulation 
B) transcriptional regulation 
C) posttranslational regulation 
D) posttranscriptional regulation 
A) translational regulation 
B) transcriptional regulation 
C) posttranslational regulation 
D) posttranscriptional regulation

Question 5

An operator and transcription unit are called an operon.

Accepted Answer

A) True 
 B)False

Question 6

Identify each labelled part of this illustration of eukaryotic DNA.  
-promoter

Accepted Answer

The answer of Identify each labelled part of this illustration...

Question 7

Match each term with its definition.
-transcriptional regulation

Accepted Answer

A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter

Question 8

Match each term with its definition.
-chromatin remodelling

Accepted Answer

A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter

Question 9

Which type of RNA is transcribed in the nucleus, folded, cleaved by Dicer protein, and is then bound to a target molecule of mRNA?

Accepted Answer

A) an mRNA that never received its poly(
A)  tail 
B) miRNA 
C) an mRNA that was not properly capped 
D) siRNA 
A) an mRNA that never received its poly(
A)  tail 
B) miRNA 
C) an mRNA that was not properly capped 
D) siRNA

Question 10

Match each term with its definition.
-inducer

Accepted Answer

A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter

Question 11

Identify each labelled part of this illustration of eukaryotic DNA.  
-proximal promoter region

Accepted Answer

The answer of Identify each labelled part of this illustration...

Question 12

Which of the following proteins binds to the operator in the operon model?

Accepted Answer

A) DNA polymoerase 
B) RNA polymerase 
C) a regulatory protein 
D) lactose 
A) DNA polymoerase 
B) RNA polymerase 
C) a regulatory protein 
D) lactose

Question 13

Which of the following determines the availability of finished proteins?

Accepted Answer

A) translational regulation 
B) transcriptional regulation 
C) posttranscriptional regulation 
D) posttranslational regulation 
A) translational regulation 
B) transcriptional regulation 
C) posttranscriptional regulation 
D) posttranslational regulation

Question 14

Acetylation is irreversible.

Accepted Answer

A) True 
 B)False

Question 15

Identify each labelled part on the illustration of the Lac operon. 
 
-promoter

Accepted Answer

The answer of Identify each labelled part on the illustration...

Question 16

Where does RNA polymerase first bind to on the E. coli lac operon?

Accepted Answer

A) to the transcription initiation site 
B) to the lacI repressor 
C) to the promoter 
D) to the operator 
A) to the transcription initiation site 
B) to the lacI repressor 
C) to the promoter 
D) to the operator

Question 17

Match each term with its definition.
-metastasis

Accepted Answer

A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
A) regulatory protein that activates the expression of an operon's genes 
B) interfering RNA molecules originally encoded by nuclear DNA 
C) process of controlling the expression of genes that takes place at the DNA level 
D) regulatory protein that prevents an operon's genes from being expressed 
E) inhibition of transcription via DNA methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter

Question 18

Suppose that a strain of E. coli containing a mutant lac operon is discovered. Also suppose that the mutant operon is normal in terms of its regulation, but the lacY gene produces a defective protein. Which metabolic function will be impaired in this bacterium?

Accepted Answer

A) transport of lactose into the cell 
B) transacetylase 
C) binding of the repressor to the operator 
D) conversion of lactose into monosaccharides 
A) transport of lactose into the cell 
B) transacetylase 
C) binding of the repressor to the operator 
D) conversion of lactose into monosaccharides

Question 19

Identify each labelled part on the illustration of the Lac operon. 
 
-RNA polymerase

Accepted Answer

The answer of Identify each labelled part on the illustration...

Question 20

Identify each labelled part of this illustration of eukaryotic DNA.  
-RNA polymerase

Accepted Answer

The answer of Identify each labelled part of this illustration...

Exam 14: Control of Gene Expression

Suppose the lacI repressor gene is permanently silenced by a mutation. What would be the impact on the function of the lac operon?

Match each term with its definition. -benign

How are the vast majority of proteins expressed early in an animal's development?

Which of the following determines the rate at which proteins are made?

An operator and transcription unit are called an operon.

Identify each labelled part of this illustration of eukaryotic DNA. -promoter

Match each term with its definition. -transcriptional regulation

Match each term with its definition. -chromatin remodelling

Which type of RNA is transcribed in the nucleus, folded, cleaved by Dicer protein, and is then bound to a target molecule of mRNA?

Match each term with its definition. -inducer

Identify each labelled part of this illustration of eukaryotic DNA. -proximal promoter region

Which of the following proteins binds to the operator in the operon model?

Which of the following determines the availability of finished proteins?

Acetylation is irreversible.

Identify each labelled part on the illustration of the Lac operon. -promoter

Where does RNA polymerase first bind to on the E. coli lac operon?

Match each term with its definition. -metastasis

Suppose that a strain of E. coli containing a mutant lac operon is discovered. Also suppose that the mutant operon is normal in terms of its regulation, but the lacY gene produces a defective protein. Which metabolic function will be impaired in this bacterium?

Identify each labelled part on the illustration of the Lac operon. -RNA polymerase

Identify each labelled part of this illustration of eukaryotic DNA. -RNA polymerase

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

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