Question 1

The X- ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the following features about DNA EXCEPT

Accepted Answer

A)  a DNA molecule has a uniform diameter of 2 nanometers. 
B)  in a DNA molecule, A pairs with T and G pairs with C. 
C)  the DNA molecule consists of repeating subunits. 
D)  a DNA molecule is helical. 
E)  the phosphate- sugar "backbone" of the molecule is on the outside of the DNA helix. 
A)  a DNA molecule has a uniform diameter of 2 nanometers. 
B)  in a DNA molecule, A pairs with T and G pairs with C. 
C)  the DNA molecule consists of repeating subunits. 
D)  a DNA molecule is helical. 
E)  the phosphate- sugar "backbone" of the molecule is on the outside of the DNA helix.

Question 2

Bacterial cells have only one DNA molecule, which is double stranded and is replicated in essentially the same f in eukaryotes. Imagine that, following the techniques of other scientists studying DNA, you created a bacterial ce contains only radioactive nitrogen in its DNA. You then place the cell in a culture medium containing only "regu (nonradioactive) nitrogen. Based on this scenario and your knowledge of DNA structure and replication, how many cells will contain some DNA with radioactive nitrogen after four rounds of cell replication?

Accepted Answer

A)  8 
B)  1 
C)  4 
D)  2 
E)  16 
A)  8 
B)  1 
C)  4 
D)  2 
E)  16

Question 3

Which of the following is TRUE in the Watson- Crick model of DNA?

Accepted Answer

A)  Phosphate groups always bond to ribose. 
B)  Four different types of bases are found in DNA. 
C)  Ribose always bonds to a nitrogenous base. 
D)  During replication, the phosphate groups are copied but the base sequence is not copied. 
E)  The number of adenines equals the number of guanines. 
A)  Phosphate groups always bond to ribose. 
B)  Four different types of bases are found in DNA. 
C)  Ribose always bonds to a nitrogenous base. 
D)  During replication, the phosphate groups are copied but the base sequence is not copied. 
E)  The number of adenines equals the number of guanines.

Question 4

By the early 1950s, many biologists realized that the key to understanding inheritance lay in the structure of

Accepted Answer

A)  enzymes. 
B)  ribosomes. 
C)  protein. 
D)  DNA. 
E)  chromosomes. 
A)  enzymes. 
B)  ribosomes. 
C)  protein. 
D)  DNA. 
E)  chromosomes.

Question 5

In semiconservative replication, a DNA molecule serves as a template for a new DNA molecule, which consists of either both parental strands of DNA or both newly synthesized strands of DNA.

Accepted Answer

A) True 
 B)False

Question 6

DNA is copied within eukaryotic cells in the process of to produce two identical DNA molecules.

Accepted Answer

The answer of DNA is copied within eukaryotic cells in...

Question 7

Briefly describe the basic process of DNA replication.

Accepted Answer

DNA helicase unwinds the double helix of

Question 8

Specific segments of DNA that code for a specific protein are called

Accepted Answer

A)  genes. 
B)  mutations. 
C)  nuclei. 
D)  chromosomes. 
E)  nucleoli. 
A)  genes. 
B)  mutations. 
C)  nuclei. 
D)  chromosomes. 
E)  nucleoli.

Question 9

Mutations are a source of genetic _ by which evolutionary change is possible.

Accepted Answer

A)  stability 
B)  constancy 
C)  reproduction 
D)  variability 
A)  stability 
B)  constancy 
C)  reproduction 
D)  variability

Question 10

Which of the following is NOT true according to Chargaff's base pairing rule?

Accepted Answer

A)  A + G = T + C in amount. 
B)  A = T in amount. 
C)  G = C in amount. 
D)  A + T = G + C in amount. 
A)  A + G = T + C in amount. 
B)  A = T in amount. 
C)  G = C in amount. 
D)  A + T = G + C in amount.

Question 11

In Griffith's experiments, what happened when heat- killed S- strain bacteria were injected into a mouse along with live R- strain bacteria?

Accepted Answer

A)  RNA from the heat- killed S- strain was translated into proteins that killed the mouse. 
B)  Proteins released from the heat- killed S- strain killed the mouse. 
C)  DNA from the live R- strain was taken up by the heat- killed S- strain, converting them to R- strain and killing the mouse. 
D)  DNA from the heat- killed S- strain was taken up by the live R- strain, converting them to S- strain and killing the mouse. 
A)  RNA from the heat- killed S- strain was translated into proteins that killed the mouse. 
B)  Proteins released from the heat- killed S- strain killed the mouse. 
C)  DNA from the live R- strain was taken up by the heat- killed S- strain, converting them to R- strain and killing the mouse. 
D)  DNA from the heat- killed S- strain was taken up by the live R- strain, converting them to S- strain and killing the mouse.

Question 12

How do scientists know that proofreading occurs during and after the DNA replication process?

Accepted Answer

DNA polymerase mismatches base

Question 13

How are the four types of nitrogen- containing bases in DNA held together in the double helix of DNA?

Accepted Answer

The bases

Question 14

After proofreading repair enzymes check the work of DNA polymerase, newly replicated DNA strands contain about one mistake for every

Accepted Answer

A)  10,000 to 1 million base pairs. 
B)  1 million to 10 million base pairs. 
C)  100 million to 10 billion base pairs. 
D)  1 to 100 base pairs. 
E)  100 to 1,000 base pairs. 
A)  10,000 to 1 million base pairs. 
B)  1 million to 10 million base pairs. 
C)  100 million to 10 billion base pairs. 
D)  1 to 100 base pairs. 
E)  100 to 1,000 base pairs.

Question 15

is the process whereby a molecule of DNA copies itself.

Accepted Answer

The answer of is the process whereby a molecule of...

Question 16

When Griffith experimented with two types of Streptococcus pneumoniae, he found that if the

Accepted Answer

A)  non- deadly strain was mixed with the heat- killed, non- deadly strain before injection, the mice died. 
B)  non- deadly strain was mixed with the heat- killed, deadly strain before injection, the mice died. 
C)  deadly strain was heat- killed before injection, the mice died. 
D)  non- deadly strain was mixed with the heat- killed, deadly strain before injection, the mice lived. 
A)  non- deadly strain was mixed with the heat- killed, non- deadly strain before injection, the mice died. 
B)  non- deadly strain was mixed with the heat- killed, deadly strain before injection, the mice died. 
C)  deadly strain was heat- killed before injection, the mice died. 
D)  non- deadly strain was mixed with the heat- killed, deadly strain before injection, the mice lived.

Question 17

"Chargaff's rule" for base pairing in DNA is that

Accepted Answer

A)  the amount of A = the amount of C, and the amount of G = the amount of T. 
B)  A bonds with T, and G bonds with C. 
C)  the amount of A = the amount of G, and the amount of C = the amount of T. 
D)  A bonds with G, and C bonds with T. 
E)  A bonds with C, and G bonds with T. 
A)  the amount of A = the amount of C, and the amount of G = the amount of T. 
B)  A bonds with T, and G bonds with C. 
C)  the amount of A = the amount of G, and the amount of C = the amount of T. 
D)  A bonds with G, and C bonds with T. 
E)  A bonds with C, and G bonds with T.

Question 18

What are the three main components of a DNA nucleotide?

Accepted Answer

A DNA nucleotide contains a su

Question 19

It became apparent to Watson and Crick after completing their model that a DNA molecule could carry a vast amount of hereditary information in its

Accepted Answer

A)  phosphate- sugar backbone. 
B)  sequence of bases. 
C)  different five- carbon sugars. 
D)  side groups of bases. 
E)  variety of phosphate groups. 
A)  phosphate- sugar backbone. 
B)  sequence of bases. 
C)  different five- carbon sugars. 
D)  side groups of bases. 
E)  variety of phosphate groups.

Question 20

The molecule

Accepted Answer

The answer of The molecule...

Exam 12: Dna: the Molecule of Heredity

The X- ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the following features about DNA EXCEPT

Which of the following is TRUE in the Watson- Crick model of DNA?

By the early 1950s, many biologists realized that the key to understanding inheritance lay in the structure of

In semiconservative replication, a DNA molecule serves as a template for a new DNA molecule, which consists of either both parental strands of DNA or both newly synthesized strands of DNA.

DNA is copied within eukaryotic cells in the process of to produce two identical DNA molecules.

Briefly describe the basic process of DNA replication.

Specific segments of DNA that code for a specific protein are called

Mutations are a source of genetic _ by which evolutionary change is possible.

Which of the following is NOT true according to Chargaff's base pairing rule?

In Griffith's experiments, what happened when heat- killed S- strain bacteria were injected into a mouse along with live R- strain bacteria?

How do scientists know that proofreading occurs during and after the DNA replication process?

How are the four types of nitrogen- containing bases in DNA held together in the double helix of DNA?

After proofreading repair enzymes check the work of DNA polymerase, newly replicated DNA strands contain about one mistake for every

is the process whereby a molecule of DNA copies itself.

When Griffith experimented with two types of Streptococcus pneumoniae, he found that if the

"Chargaff's rule" for base pairing in DNA is that

What are the three main components of a DNA nucleotide?

It became apparent to Watson and Crick after completing their model that a DNA molecule could carry a vast amount of hereditary information in its

The molecule

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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