Question 1

In females with incontinentia pigmenti, the mosaic effect of X inactivation in human females can be observed in

Accepted Answer

A) skin color. 
B) hair color. 
C) distribution of fat cells. 
D) distribution of sweat glands. 
E) all of these. 
A) skin color. 
B) hair color. 
C) distribution of fat cells. 
D) distribution of sweat glands. 
E) all of these.

Question 2

The development of organisms is based on

Accepted Answer

A) which genes are active in a given cell. 
B) when the genes function. 
C) what gene products appear. 
D) the amount of cellular products generated. 
E) all of these. 
A) which genes are active in a given cell. 
B) when the genes function. 
C) what gene products appear. 
D) the amount of cellular products generated. 
E) all of these.

Question 3

Homeotic genes

Accepted Answer

A) code for homeodomains. 
B) code for regulatory proteins. 
C) are a class of master genes. 
D) affect transcription. 
E) are all of these. 
A) code for homeodomains. 
B) code for regulatory proteins. 
C) are a class of master genes. 
D) affect transcription. 
E) are all of these.

Question 4

As a result of the action illustrated in the figure,

Accepted Answer

A) structural genes are transcribed. 
B) lactose is broken down. 
C) the lactose operon is repressed. 
D) the regulatory gene is inactivated. 
E) lactose production is enhanced. 
A) structural genes are transcribed. 
B) lactose is broken down. 
C) the lactose operon is repressed. 
D) the regulatory gene is inactivated. 
E) lactose production is enhanced.

Question 5

Differentiation is the process by which cells

Accepted Answer

A) mature into larger cells. 
B) change from one type of muscle to another. 
C) allows cells to change to fix injuries. 
D) turn on all the genomic genes. 
E) become specialized by turning on some genes and turning off others. 
A) mature into larger cells. 
B) change from one type of muscle to another. 
C) allows cells to change to fix injuries. 
D) turn on all the genomic genes. 
E) become specialized by turning on some genes and turning off others.

Question 6

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 7

Which of the following statements is false concerning breast cancer?

Accepted Answer

A) It develops in one of 10,000 females a year. 
B) About 180,000 new cases are diagnosed a year in the United States. 
C) It does not affect males. 
D) It may have many underlying causes. 
E) Gene mutations predispose individuals to developing certain kinds of breast cancer. 
A) It develops in one of 10,000 females a year. 
B) About 180,000 new cases are diagnosed a year in the United States. 
C) It does not affect males. 
D) It may have many underlying causes. 
E) Gene mutations predispose individuals to developing certain kinds of breast cancer.

Question 8

X chromosome inactivation results in the

Accepted Answer

A) total inactivation of both X chromosomes. 
B) inactivation of only the paternal X chromosome. 
C) inactivation of only the maternal X chromosome. 
D) inactivation of either the paternal X chromosome or the maternal X chromosome. 
E) nonrandom inactivation of X chromosomes in the initial cells of tissues. 
A) total inactivation of both X chromosomes. 
B) inactivation of only the paternal X chromosome. 
C) inactivation of only the maternal X chromosome. 
D) inactivation of either the paternal X chromosome or the maternal X chromosome. 
E) nonrandom inactivation of X chromosomes in the initial cells of tissues.

Question 9

Mutation of the C group gene in Arabidopsis thaliana produces flowers that

Accepted Answer

A) are sterile. 
B) have no carpels. 
C) have no stamens. 
D) have a profusion of petals. 
E) are all of these. 
A) are sterile. 
B) have no carpels. 
C) have no stamens. 
D) have a profusion of petals. 
E) are all of these.

Question 10

Regulatory elements in gene control interact with

Accepted Answer

A) new polypeptide chains. 
B) DNA. 
C) RNA. 
D) final proteins. 
E) all of these. 
A) new polypeptide chains. 
B) DNA. 
C) RNA. 
D) final proteins. 
E) all of these.

Question 11

The rate at which mRNA is processed by ribosomes is an example of

Accepted Answer

A) transcriptional control. 
B) transcript processing control. 
C) transport control. 
D) translational control. 
E) post-translational control. 
A) transcriptional control. 
B) transcript processing control. 
C) transport control. 
D) translational control. 
E) post-translational control.

Question 12

Homeotic genes generally control

Accepted Answer

A) X chromosome inactivation. 
B) formation of specific body parts 
C) hormone synthesis. 
D) dosage compensation. 
E) none of these. 
A) X chromosome inactivation. 
B) formation of specific body parts 
C) hormone synthesis. 
D) dosage compensation. 
E) none of these.

Question 13

Which statement is false concerning the lactose operon?

Accepted Answer

A) It contains a set of operators. 
B) It contains three structural genes that manufacture lactose-metabolizing enzymes. 
C) It contains a single promoter. 
D) It contains a single operator. 
E) The promoter lies between two operators. 
A) It contains a set of operators. 
B) It contains three structural genes that manufacture lactose-metabolizing enzymes. 
C) It contains a single promoter. 
D) It contains a single operator. 
E) The promoter lies between two operators.

Question 14

When cells stop responding to normal controls over growth and division they

Accepted Answer

A) begin to form a tumor. 
B) produce a malignancy. 
C) start to die. 
D) kill surrounding cells. 
E) produce scar tissue. 
A) begin to form a tumor. 
B) produce a malignancy. 
C) start to die. 
D) kill surrounding cells. 
E) produce scar tissue.

Question 15

Which of the following statements is false?

Accepted Answer

A) All the cells of a human have the same genes. 
B) Only red blood cells have hemoglobin genes. 
C) Different genes are activated depending on the cell they are in. 
D) Liver cells and brain cells differ mostly in form and function, not in the genes they have. 
E) Cells don't express all of their genes all of the time. 
A) All the cells of a human have the same genes. 
B) Only red blood cells have hemoglobin genes. 
C) Different genes are activated depending on the cell they are in. 
D) Liver cells and brain cells differ mostly in form and function, not in the genes they have. 
E) Cells don't express all of their genes all of the time.

Question 16

Genes located in cells in different regions of the body during embryonic development may

Accepted Answer

A) be turned on and off. 
B) never be turned on. 
C) be turned on and left on. 
D) be activated for only a short time in one cell and a long time in another cell. 
E) do all of these. 
A) be turned on and off. 
B) never be turned on. 
C) be turned on and left on. 
D) be activated for only a short time in one cell and a long time in another cell. 
E) do all of these.

Question 17

In the ABC model of flower development in Arabidopsis thaliana, sepals form when gene(s) __________ is(are) switched on.

Accepted Answer

A) A 
B) A and B 
C) B and C 
D) C 
E) A and B and C 
A) A 
B) A and B 
C) B and C 
D) C 
E) A and B and C

Question 18

The activation of enzymes by the removal of a portion of polypeptide chain is an example of

Accepted Answer

A) transcriptional control. 
B) transcript processing control. 
C) transport control. 
D) translational control. 
E) post-translational control. 
A) transcriptional control. 
B) transcript processing control. 
C) transport control. 
D) translational control. 
E) post-translational control.

Question 19

Repressor proteins

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) do all of these. 
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) do all of these.

Question 20

In the ABC model of flower development in Arabidopsis thaliana, carpels form when gene(s) __________ is(are) switched on.

Accepted Answer

A) A 
B) A and B 
C) B and C 
D) C 
E) A and B and C 
A) A 
B) A and B 
C) B and C 
D) C 
E) A and B and C

Exam 15: Controls Over Genes

In females with incontinentia pigmenti, the mosaic effect of X inactivation in human females can be observed in

The development of organisms is based on

Homeotic genes

As a result of the action illustrated in the figure,

Differentiation is the process by which cells

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

Which of the following statements is false concerning breast cancer?

X chromosome inactivation results in the

Mutation of the C group gene in Arabidopsis thaliana produces flowers that

Regulatory elements in gene control interact with

The rate at which mRNA is processed by ribosomes is an example of

Homeotic genes generally control

Which statement is false concerning the lactose operon?

When cells stop responding to normal controls over growth and division they

Which of the following statements is false?

Genes located in cells in different regions of the body during embryonic development may

In the ABC model of flower development in Arabidopsis thaliana, sepals form when gene(s) __________ is(are) switched on.

The activation of enzymes by the removal of a portion of polypeptide chain is an example of

Repressor proteins

In the ABC model of flower development in Arabidopsis thaliana, carpels form when gene(s) __________ is(are) switched on.

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters