Question 1

In eukaryotic cells, chromosomes are composed of both DNA and proteins. True or False?

Accepted Answer

A) True 
 B)False  True

Question 2

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. True or False?

Accepted Answer

A) True 
 B)False  False

Question 3

A cell that lacks the ability to make DNA repair enzymes will:

Accepted Answer

A) be able to correctly replicate its DNA, but it will need more time to do so. 
B) be unable to replicate its DNA. 
C) replicate its DNA as well as a cell with intact repair enzymes. 
D) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. 
A) be able to correctly replicate its DNA, but it will need more time to do so. 
B) be unable to replicate its DNA. 
C) replicate its DNA as well as a cell with intact repair enzymes. 
D) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. D

Question 4

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 5

Suppose a scientist working on a new drug for cancer developed a chemical that irreversibly breaks the hydrogen bonds in the DNA molecules within cancerous cells but leaves all of the covalent bonds intact. Hydrogen bonds are relatively weak compared to covalent bonds, and they are routinely broken and reformed as the DNA molecule is replicated in a normal cell. Their stability is nonetheless critical for maintaining certain aspects of the structure and function of the DNA molecule. Based on this scenario and your knowledge of DNA, how would this newly discovered chemical affect the "molecule of heredity" in a human cancer cell?

Accepted Answer

A) It would allow the DNA molecule to function normally except during replication. 
B) It would result in constant DNA replication within the cell. 
C) It would break the two strands of the DNA molecule apart, preventing it from functioning normally. 
D) It would break the individual strands of the DNA molecule apart, preventing it from functioning normally. 
A) It would allow the DNA molecule to function normally except during replication. 
B) It would result in constant DNA replication within the cell. 
C) It would break the two strands of the DNA molecule apart, preventing it from functioning normally. 
D) It would break the individual strands of the DNA molecule apart, preventing it from functioning normally.

Question 6

The X-ray diffraction studies of the British scientists named ________ were essential for the discovery of the structure of the DNA molecule.

Accepted Answer

Wilkins an

Question 7

Chargaff found that the amounts of the four bases vary from species to species, but the amount of adenine always equals the amount of guanine and the amount of thymine always equals the amount of cytosine. True or False?

Accepted Answer

A) True 
 B)False

Question 8

Inversions are movements of DNA from one chromosome to another. True or False?

Accepted Answer

A) True 
 B)False

Question 9

When Hershey and Chase labeled phage with radioactive phosphorus, they concluded that the phage injects its DNA, not protein, into its host. These conclusions were based on the observation that the radioactive DNA ended up where?

Accepted Answer

The DNA en

Question 10

A DNA nucleotide is made up of (in the correct sequence):

Accepted Answer

A) phosphate-deoxyribose-nitrogen-base. 
B) phospholipid-deoxyribose-base. 
C) phosphate-deoxyribose-phosphate-deoxyribose. 
D) adenine-thymine-guanine-cytosine. 
E) base-phosphate-glucose. 
A) phosphate-deoxyribose-nitrogen-base. 
B) phospholipid-deoxyribose-base. 
C) phosphate-deoxyribose-phosphate-deoxyribose. 
D) adenine-thymine-guanine-cytosine. 
E) base-phosphate-glucose.

Question 11

At one end of a double helix, one strand has a free sugar (3')group and the other has a free ________ group.

Accepted Answer

The answer of At one end of a double helix,...

Question 12

Regarding the structure of DNA, the units that form the "uprights" of the DNA ladder and do not attach to the nitrogen bases are:

Accepted Answer

A) deoxyribose molecules. 
B) phosphate molecules. 
C) ribose molecules. 
D) sulfur-containing bases. 
A) deoxyribose molecules. 
B) phosphate molecules. 
C) ribose molecules. 
D) sulfur-containing bases.

Question 13

Complementary base pairs are held together by:

Accepted Answer

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

Question 14

Briefly describe the experiments conducted by Avery, McCarty, and MacLeod. What was the relevance of their research?

Accepted Answer

The Avery, McCarty, and MacLeo

Question 15

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

Question 16

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

Question 17

In one strand of DNA, the nucleotide sequence is 5'-A-T-G-C-3'. The complementary sequence in the other strand must be:

Accepted Answer

A) 5'-C-G-T-A-3'. 
B) 5'-A-T-G-C-3'. 
C) 3'-T-A-C-G-5'. 
D) 3'-G-C-A-T-5'. 
A) 5'-C-G-T-A-3'. 
B) 5'-A-T-G-C-3'. 
C) 3'-T-A-C-G-5'. 
D) 3'-G-C-A-T-5'.

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

Adenine is complemen

Question 20

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

Accepted Answer

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

Exam 11: Dna: the Molecule of Heredity

In eukaryotic cells, chromosomes are composed of both DNA and proteins. True or False?

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. True or False?

A cell that lacks the ability to make DNA repair enzymes will:

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

The X-ray diffraction studies of the British scientists named ________ were essential for the discovery of the structure of the DNA molecule.

Chargaff found that the amounts of the four bases vary from species to species, but the amount of adenine always equals the amount of guanine and the amount of thymine always equals the amount of cytosine. True or False?

Inversions are movements of DNA from one chromosome to another. True or False?

When Hershey and Chase labeled phage with radioactive phosphorus, they concluded that the phage injects its DNA, not protein, into its host. These conclusions were based on the observation that the radioactive DNA ended up where?

A DNA nucleotide is made up of (in the correct sequence):

At one end of a double helix, one strand has a free sugar (3')group and the other has a free ________ group.

Regarding the structure of DNA, the units that form the "uprights" of the DNA ladder and do not attach to the nitrogen bases are:

Complementary base pairs are held together by:

Briefly describe the experiments conducted by Avery, McCarty, and MacLeod. What was the relevance of their research?

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):

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

In one strand of DNA, the nucleotide sequence is 5'-A-T-G-C-3'. The complementary sequence in the other strand must be:

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

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

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

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

The Continuity of Life: Cellular 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 Amidst 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

How Do Ecosystems Work

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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