Question 1

Is the lac operon transcribed when lactose is present?

Accepted Answer

A)  Yes, lactose is converted to another sugar that binds to the repressor, freeing the promoter region. 
B)  Yes, lactose binds to RNA polymerase, allowing it to bind to the promoter and transcribe the operon. 
C)  No, lactose is converted to another sugar that binds to the two operators preventing transcription. 
D)  No, lactose has no effect on transcription of the lac operon. 
E)  No, lactose binds to the second operator, blocking transcription by RNA polymerase. 
A)  Yes, lactose is converted to another sugar that binds to the repressor, freeing the promoter region. 
B)  Yes, lactose binds to RNA polymerase, allowing it to bind to the promoter and transcribe the operon. 
C)  No, lactose is converted to another sugar that binds to the two operators preventing transcription. 
D)  No, lactose has no effect on transcription of the lac operon. 
E)  No, lactose binds to the second operator, blocking transcription by RNA polymerase. A

Question 2

Which of the following is the binding site for RNA polymerase on the DNA molecule?

Accepted Answer

A)  Structural genes 
B)  Repressor genes 
C)  Promoter sequence 
D)  Operator sequence 
E)  The region between an operator and the first structural gene 
A)  Structural genes 
B)  Repressor genes 
C)  Promoter sequence 
D)  Operator sequence 
E)  The region between an operator and the first structural gene C

Question 3

Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster)revealed local controls over gene expression.

Accepted Answer

Homeotic

Question 4

Choose the one most appropriate answer for each.
-Histone

Accepted Answer

A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates 
A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates

Question 5

_____________ refers to potentially heritable modifications to DNA that can affect gene expression without changing the DNA sequence.

Accepted Answer

A)  Genetic 
B)  Generative 
C)  Genial 
D)  Epigenetic 
E)  Epigenomic 
A)  Genetic 
B)  Generative 
C)  Genial 
D)  Epigenetic 
E)  Epigenomic

Question 6

Choose the one most appropriate answer for each.
-Transcriptional control

Accepted Answer

A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation 
A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation

Question 7

Researchers tend to name genes based on what happens in their absence.The tinman gene in Drosophila results in flies ______________________.

Accepted Answer

A)  without hearts 
B)  with nonjointed legs 
C)  with a thick exoskeleton 
D)  with rust colored eyes 
E)  without brains 
A)  without hearts 
B)  with nonjointed legs 
C)  with a thick exoskeleton 
D)  with rust colored eyes 
E)  without brains

Question 8

Mutation in a B group gene in Arabidopsis thaliana affects development in its flower's ______________.

Accepted Answer

A)  first whorl only 
B)  second whorl only 
C)  third whorl only 
D)  first and second whorls 
E)  second and third whorls 
A)  first whorl only 
B)  second whorl only 
C)  third whorl only 
D)  first and second whorls 
E)  second and third whorls

Question 9

Repressor proteins do not __________________.

Accepted Answer

A)  prevent binding of RNA polymerase to DNA 
B)  cause the DNA regions that contain the operator to twist or loop 
C)  inactivate operon genes when their products are not required 
D)  bind to sets of operators 
E)  increase transcription rates 
A)  prevent binding of RNA polymerase to DNA 
B)  cause the DNA regions that contain the operator to twist or loop 
C)  inactivate operon genes when their products are not required 
D)  bind to sets of operators 
E)  increase transcription rates

Question 10

In an egg,cytoplasmic localization of mRNA occurs when the transcripts ____________.

Accepted Answer

A)  are bound to specific proteins 
B)  are small enough 
C)  are attached to fat soluble molecules 
D)  contain specific introns 
E)  are attached to ribosome subunits manufactured in the nucleus 
A)  are bound to specific proteins 
B)  are small enough 
C)  are attached to fat soluble molecules 
D)  contain specific introns 
E)  are attached to ribosome subunits manufactured in the nucleus

Question 11

Choose the one most appropriate answer for each.
-Master genes

Accepted Answer

A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates 
A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates

Question 12

The obvious advantage of the lac operon is that it ________________________.

Accepted Answer

A)  allows bacteria to survive in the presence of lactose 
B)  eliminates the need for lactose-metabolizing enzymes when lactose is not present 
C)  enables bacteria to make lactose only in the presence of the proper enzymes 
D)  negates the need for milk in the diet of adult humans 
E)  enables glucose to substitute for lactose in the diet of lactose intolerant persons 
A)  allows bacteria to survive in the presence of lactose 
B)  eliminates the need for lactose-metabolizing enzymes when lactose is not present 
C)  enables bacteria to make lactose only in the presence of the proper enzymes 
D)  negates the need for milk in the diet of adult humans 
E)  enables glucose to substitute for lactose in the diet of lactose intolerant persons

Question 13

A cycle of biological activity that repeats around every 24 hours.

Accepted Answer

A)  Circadian rhythm 
B)  Photosynthesis 
C)  Respiration 
D)  Glycolysis 
E)  Photorespiration 
A)  Circadian rhythm 
B)  Photosynthesis 
C)  Respiration 
D)  Glycolysis 
E)  Photorespiration

Question 14

In prokaryotes,control of gene expression is mainly at the level of ____.

Accepted Answer

A)  transcription 
B)  transcript processing 
C)  transport 
D)  translation 
E)  post-translation 
A)  transcription 
B)  transcript processing 
C)  transport 
D)  translation 
E)  post-translation

Question 15

Choose the one most appropriate answer for each.
-Post-translational control

Accepted Answer

A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation 
A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation

Question 16

Classification. Choose the proper item below for the following statements.
-A repressor protein can shut down transcription by binding here

Accepted Answer

A) Operon 
B) Operator 
C) Promoter 
D) Repressor protein 
E) Regulator protein 
A) Operon 
B) Operator 
C) Promoter 
D) Repressor protein 
E) Regulator protein

Question 17

In female mammals,most genes on one of the two X chromosomes are permanently inaccessible,a phenomenon called __________.

Accepted Answer

X chromoso

Question 18

Choose the one most appropriate answer for each.
-X chromosome inactivation

Accepted Answer

A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation 
A) Influences the amount and kinds of mRNA assembled from structural gene 
B) Splicing, capping, and adding a poly-A tail 
C) Nuclear envelope selectively regulates passage of transcripts 
D) Phosphorylation of translated protein 
E) Dosage compensation

Question 19

The products of genes that are switched on in specific tissues at specific stages of development affect mainly _______________.

Accepted Answer

A)  gene replication 
B)  gene transcription 
C)  mRNA transcript processing 
D)  translation 
E)  post-translational processing of proteins 
A)  gene replication 
B)  gene transcription 
C)  mRNA transcript processing 
D)  translation 
E)  post-translational processing of proteins

Question 20

Choose the one most appropriate answer for each.
-Repressor protein

Accepted Answer

A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates 
A) A condensed X chromosome 
B) Protein that combines with DNA all along its length 
C) Attaches or detaches from operator to regulate transcription 
D) Portion of the operon that binds RNA polymerase 
E) Genes that induce expression of other genes
F)Genes controlling the development of specific body parts
G)Mechanism of equalizing gene expression between the sexes
H)Binding sites on DNA for regulatory proteins that increase transcription rates

Exam 10: Control of Gene Expression

Is the lac operon transcribed when lactose is present?

Which of the following is the binding site for RNA polymerase on the DNA molecule?

Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster)revealed local controls over gene expression.

Choose the one most appropriate answer for each. -Histone

_____________ refers to potentially heritable modifications to DNA that can affect gene expression without changing the DNA sequence.

Choose the one most appropriate answer for each. -Transcriptional control

Researchers tend to name genes based on what happens in their absence.The tinman gene in Drosophila results in flies ______________________.

Mutation in a B group gene in Arabidopsis thaliana affects development in its flower's ______________.

Repressor proteins do not __________________.

In an egg,cytoplasmic localization of mRNA occurs when the transcripts ____________.

Choose the one most appropriate answer for each. -Master genes

The obvious advantage of the lac operon is that it ________________________.

A cycle of biological activity that repeats around every 24 hours.

In prokaryotes,control of gene expression is mainly at the level of ____.

Choose the one most appropriate answer for each. -Post-translational control

Classification. Choose the proper item below for the following statements. -A repressor protein can shut down transcription by binding here

In female mammals,most genes on one of the two X chromosomes are permanently inaccessible,a phenomenon called __________.

Choose the one most appropriate answer for each. -X chromosome inactivation

The products of genes that are switched on in specific tissues at specific stages of development affect mainly _______________.

Choose the one most appropriate answer for each. -Repressor protein

Invitation to Biology

Life's Chemical Bases

Molecules of Life

Cell Structure

Ground Rules of Metabolism

Where it Starts—Photosynthesis

How Cells Release Chemical Energy

DNA Structure and Function

From DNA to Protein

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Studying and Manipulating Genomes

Evidence of Evolution

Processes of Evolution

Organizing Information about Species

Life's Origin and Early Evolution

Viruses, Bacteria, and Archaea

Protists: The Simplest Eukaryotes

The Land Plants

Fungi

Animal Evolution: The Invertebrates

Animal Evolution: The Chordates

Human Evolution

Plant Tissues

Plant Nutrition and Transport

Life Cycles of Flowering Plants

Communication Strategies in Plants

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Nutrition

Maintaining the Internal Environment

Animal Reproductive System

Animal Development

Animal Behavior

Population Ecology

Community Ecology

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters