Question 1

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

Accepted Answer

DNA; protein

Question 2

Watson and Crick are credited with the discovery and description of the DNA

Accepted Answer

A)  covalent bonds. 
B)  double helix. 
C)  deoxyribose sugar. 
D)  phosphate group. 
E)  hydrogen bonds. 
A)  covalent bonds. 
B)  double helix. 
C)  deoxyribose sugar. 
D)  phosphate group. 
E)  hydrogen bonds. B

Question 3

Imagine that a DNA sequence of 5'- A- C- G- T- A- C- G- T- 3' is altered to 5'- A- C- G- A- C- G- T- 3'. This could happen as a result of a(n)

Accepted Answer

A)  insertion mutation. 
B)  inversion. 
C)  deletion mutation. 
D)  translocation. 
E)  nucleotide substitution mutation. 
A)  insertion mutation. 
B)  inversion. 
C)  deletion mutation. 
D)  translocation. 
E)  nucleotide substitution mutation. C

Question 4

How many different kinds of nucleotides are in DNA?

Accepted Answer

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

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

The two strands of DNA are held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 7

What two bases in the DNA molecule are double- ringed?

Accepted Answer

A)  Guanine and cytosine 
B)  Thymine and cytosine 
C)  Thymine and uracil 
D)  Guanine and adenine 
E)  Uracil and guanine 
A)  Guanine and cytosine 
B)  Thymine and cytosine 
C)  Thymine and uracil 
D)  Guanine and adenine 
E)  Uracil and guanine

Question 8

The sequence of subunits in the DNA "backbone" is

Accepted Answer

A)  - base- phosphate- base- phosphate- base- phosphate- . 
B)  - phosphate- sugar- phosphate- sugar- phosphate- sugar- . 
C)  - base- phosphate- sugar- base- phosphate- sugar- . 
D)  - sugar- base- sugar- base- sugar- base- sugar- base- . 
E)  - base- sugar- phosphate- base- sugar- phosphate- . 
A)  - base- phosphate- base- phosphate- base- phosphate- . 
B)  - phosphate- sugar- phosphate- sugar- phosphate- sugar- . 
C)  - base- phosphate- sugar- base- phosphate- sugar- . 
D)  - sugar- base- sugar- base- sugar- base- sugar- base- . 
E)  - base- sugar- phosphate- base- sugar- phosphate- .

Question 9

Which of the following is NOT involved in the DNA replication process?

Accepted Answer

A)  DNA replicase 
B)  DNA ligase 
C)  DNA helicase 
D)  DNA polymerase 
A)  DNA replicase 
B)  DNA ligase 
C)  DNA helicase 
D)  DNA polymerase

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

In DNA, phosphate groups bond to

Accepted Answer

A)  ribose. 
B)  adenine. 
C)  deoxyribose. 
D)  other phosphate groups. 
E)  pyrimidine bases. 
A)  ribose. 
B)  adenine. 
C)  deoxyribose. 
D)  other phosphate groups. 
E)  pyrimidine bases.

Question 12

Based on this figure, which type(s) of bacteria would you expect to be isolated from the dead mouse in the final experiment (involving the mixture of bacterial strains)?

Accepted Answer

A)  Heat- killed S- strain only 
B)  At least some living S- strain 
C)  Living R- strain and heat- killed S- strain only 
D)  Living R- strain only 
A)  Heat- killed S- strain only 
B)  At least some living S- strain 
C)  Living R- strain and heat- killed S- strain only 
D)  Living R- strain only

Question 13

Which component of a DNA nucleotide could be removed without breaking the polynucleotide chain?

Accepted Answer

A)  Deoxyribose 
B)  Nitrogen base 
C)  Phosphate 
D)  Ribose 
A)  Deoxyribose 
B)  Nitrogen base 
C)  Phosphate 
D)  Ribose

Question 14

Imagine that a DNA sequence of 5'- A- C- G- T- A- C- G- T- 3' is altered to 5'- A- C- G- C- A- C- G- T- 3'. This could happen as a result of a(n)

Accepted Answer

A)  nucleotide substitution mutation. 
B)  insertion mutation. 
C)  deletion mutation. 
D)  inversion. 
E)  translocation. 
A)  nucleotide substitution mutation. 
B)  insertion mutation. 
C)  deletion mutation. 
D)  inversion. 
E)  translocation.

Question 15

Which of the following is TRUE regarding how the DNA in your body's cells can accumulate mutations?

Accepted Answer

A)  The ultraviolet radiation in sunlight may induce changes in DNA. 
B)  Some DNA spontaneously breaks down every second, making the chromosome significantly shorter with every passing day. 
C)  Mistakes are never made during DNA replication; they always occur during the G1 phase of interphase. 
D)  Spontaneous mutation rates are around one in every four nucleotides that are replicated. 
A)  The ultraviolet radiation in sunlight may induce changes in DNA. 
B)  Some DNA spontaneously breaks down every second, making the chromosome significantly shorter with every passing day. 
C)  Mistakes are never made during DNA replication; they always occur during the G1 phase of interphase. 
D)  Spontaneous mutation rates are around one in every four nucleotides that are replicated.

Question 16

DNA polymerase and other repair enzymes _ the newly synthesized DNA strand during and after the replication process.

Accepted Answer

proofread

Question 17

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

Accepted Answer

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

Question 18

Regarding the structure of DNA, which of the following joins adenine and thymine and also guanine and cytosine?

Accepted Answer

A)  Phosphate 
B)  Covalent bonds 
C)  Hydrogen bonds 
D)  Deoxyribose 
E)  Double helix 
A)  Phosphate 
B)  Covalent bonds 
C)  Hydrogen bonds 
D)  Deoxyribose 
E)  Double helix

Question 19

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

Question 20

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.

Exam 12: Dna: the Molecule of Heredity

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

Watson and Crick are credited with the discovery and description of the DNA

Imagine that a DNA sequence of 5'- A- C- G- T- A- C- G- T- 3' is altered to 5'- A- C- G- A- C- G- T- 3'. This could happen as a result of a(n)

How many different kinds of nucleotides are in DNA?

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

The two strands of DNA are held together by hydrogen bonds.

What two bases in the DNA molecule are double- ringed?

The sequence of subunits in the DNA "backbone" is

Which of the following is NOT involved in the DNA replication process?

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

In DNA, phosphate groups bond to

Based on this figure, which type(s) of bacteria would you expect to be isolated from the dead mouse in the final experiment (involving the mixture of bacterial strains)?

Which component of a DNA nucleotide could be removed without breaking the polynucleotide chain?

Imagine that a DNA sequence of 5'- A- C- G- T- A- C- G- T- 3' is altered to 5'- A- C- G- C- A- C- G- T- 3'. This could happen as a result of a(n)

Which of the following is TRUE regarding how the DNA in your body's cells can accumulate mutations?

DNA polymerase and other repair enzymes _ the newly synthesized DNA strand during and after the replication process.

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

Regarding the structure of DNA, which of the following joins adenine and thymine and also guanine and cytosine?

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

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

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

Filters