Question 1

DNA polymerase always moves from__________ along the strand resulting in DNA replication to be continuous on one strand and discontinuous on the other.

Accepted Answer

A)  base to phosphor group 
B)  phosphate group to base 
C)  5? to 3? 
D)  3? to 5? 
A)  base to phosphor group 
B)  phosphate group to base 
C)  5? to 3? 
D)  3? to 5?

Question 2

How many different kinds of base pairings are in DNA?

Accepted Answer

A)  Millions 
B)  Two 
C)  Hundreds or thousands 
D)  Four 
A)  Millions 
B)  Two 
C)  Hundreds or thousands 
D)  Four

Question 3

How many bases are in the DNA molecule of a typical human chromosome?

Accepted Answer

A)  Two 
B)  Millions 
C)  Four 
D)  Thousands 
A)  Two 
B)  Millions 
C)  Four 
D)  Thousands

Question 4

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)  the phosphate-sugar ʺbackboneʺ of the molecule is on the outside of the DNA helix. 
E)  a DNA molecule is helical. 
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)  the phosphate-sugar ʺbackboneʺ of the molecule is on the outside of the DNA helix. 
E)  a DNA molecule is helical.

Question 5

If the quantities of the four bases in a DNA molecule are measured, we find that

Accepted Answer

A)  A = C and G = T. 
B)  T = A and C = G. 
C)  A = G and C = T. 
D)  no two bases are equal in amount. 
E)  all bases are equal in amount. 
A)  A = C and G = T. 
B)  T = A and C = G. 
C)  A = G and C = T. 
D)  no two bases are equal in amount. 
E)  all bases are equal in amount.

Question 6

Regarding the structure of DNA, which of the following is covalently bonded to a nitrogen base?

Accepted Answer

A)  Phosphate 
B)  Phospholipid 
C)  Deoxyribose 
D)  Hydrogen bonds 
E)  Ribose 
A)  Phosphate 
B)  Phospholipid 
C)  Deoxyribose 
D)  Hydrogen bonds 
E)  Ribose

Question 7

In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are

Accepted Answer

A)  the backbones of the molecule. 
B)  deoxyribose linked to phosphate. 
C)  nitrogenous bases linked together. 
D)  deoxyribose linked to sulfate. 
E)  nitrogenous bases linked to phosphate. 
A)  the backbones of the molecule. 
B)  deoxyribose linked to phosphate. 
C)  nitrogenous bases linked together. 
D)  deoxyribose linked to sulfate. 
E)  nitrogenous bases linked to phosphate.

Question 8

If cytosine makes up 15% of the bases in a sample of DNA from an organism, then adenine makes up what percentage of the bases?

Accepted Answer

The answer of If cytosine makes up 15% of the...

Question 9

DNA replication occurs without errors due to the complementary base pairing used in the copying process.

Accepted Answer

A) True 
 B)False

Question 10

If the DNA of a certain organism has guanine as 30% of its bases, then what percentage of its bases are adenine?

Accepted Answer

A)  0% 
B)  10% 
C)  40% 
D)  30% 
E)  20% 
A)  0% 
B)  10% 
C)  40% 
D)  30% 
E)  20%

Question 11

Chromosomes contain both __________and__________ , and early -20th-century scientists were unsure which of these molecules carried the heritable units called genes.

Accepted Answer

The answer of Chromosomes contain both __________and__________ , and early...

Question 12

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

Question 13

Complementary base pairs are held together by

Accepted Answer

A)  hydrogen bonds. 
B)  covalent bonds. 
C)  disulfide bonds. 
D)  ionic bonds. 
E)  peptide bonds. 
A)  hydrogen bonds. 
B)  covalent bonds. 
C)  disulfide bonds. 
D)  ionic bonds. 
E)  peptide bonds.

Question 14

What is the relationship among DNA, a gene, and a chromosome?

Accepted Answer

A)  A gene contains hundreds of chromosomes, which are composed of protein. 
B)  A gene is composed of DNA, but it has no relationship to a chromosome. 
C)  A chromosome contains hundreds of genes, which are composed of DNA. 
D)  A chromosome contains hundreds of genes, which are composed of protein. 
E)  A gene contains hundreds of chromosomes, which are composed of DNA. 
A)  A gene contains hundreds of chromosomes, which are composed of protein. 
B)  A gene is composed of DNA, but it has no relationship to a chromosome. 
C)  A chromosome contains hundreds of genes, which are composed of DNA. 
D)  A chromosome contains hundreds of genes, which are composed of protein. 
E)  A gene contains hundreds of chromosomes, which are composed of DNA.

Question 15

In eukaryotic cells, chromosomes are composed of both DNA and proteins.

Accepted Answer

A) True 
 B)False

Question 16

Name the four types of nitrogen-containing bases in DNA. Which bases are complementary?

Accepted Answer

Adenine is complemen

Question 17

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

Accepted Answer

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

Exam 12: DNA: The Molecule of Heredity

DNA polymerase always moves from__________ along the strand resulting in DNA replication to be continuous on one strand and discontinuous on the other.

How many different kinds of base pairings are in DNA?

How many bases are in the DNA molecule of a typical human chromosome?

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

If the quantities of the four bases in a DNA molecule are measured, we find that

Regarding the structure of DNA, which of the following is covalently bonded to a nitrogen base?

In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are

If cytosine makes up 15% of the bases in a sample of DNA from an organism, then adenine makes up what percentage of the bases?

DNA replication occurs without errors due to the complementary base pairing used in the copying process.

If the DNA of a certain organism has guanine as 30% of its bases, then what percentage of its bases are adenine?

Chromosomes contain both __________and__________ , and early -20th-century scientists were unsure which of these molecules carried the heritable units called genes.

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

Complementary base pairs are held together by

What is the relationship among DNA, a gene, and a chromosome?

In eukaryotic cells, chromosomes are composed of both DNA and proteins.

Name the four types of nitrogen-containing bases in DNA. Which bases are complementary?

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

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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Chromosomes contain both and , and early -20th-century scientists were unsure which of these molecules carried the heritable units called genes.