Question 1

The five stages of a lytic infection are attachment, penetration, __________, assembly, and release.

Accepted Answer

A)  lysis 
B)  prophage 
C)  lysogenesis 
D)  transduction 
E)  replication 
A)  lysis 
B)  prophage 
C)  lysogenesis 
D)  transduction 
E)  replication E

Question 2

__________ conversion occurs when a bacterium carrying viral genes takes on new, atypical characteristics.

Accepted Answer

A)  Transducing 
B)  Lysogenic 
C)  Prophage 
D)  Lytic 
E)  Reverse 
A)  Transducing 
B)  Lysogenic 
C)  Prophage 
D)  Lytic 
E)  Reverse B

Question 3

MATCHING
Match the virus group with nucleic acid description
a.ssRNA that can serve as mRNA ; enveloped viruses
d.dsDNA : nonenveloped virus
b.ssRNA enveloped viruses;contains reverse transcriptase for transcription of RNA into DNA; two identical molecules ssRNA
e.dsDNA: large complex enveloped virus virus; replicates in host nucleus
c.ssRNA that serves as template for mRNA synthesis ; medium sized enveloped that often exhibit projecting spikes
-Togaviruses

Accepted Answer

A

Question 4

Which of the following diseases is not caused by a virus?

Accepted Answer

A)  rabies 
B)  polio 
C)  warts in humans 
D)  chickenpox 
E)  Lyme disease 
A)  rabies 
B)  polio 
C)  warts in humans 
D)  chickenpox 
E)  Lyme disease

Question 5

The specificity of viruses to different types of cells is due to __________ sites on the host cell.

Accepted Answer

A)  prophage 
B)  receptor 
C)  transduction 
D)  penetration 
E)  transcription 
A)  prophage 
B)  receptor 
C)  transduction 
D)  penetration 
E)  transcription

Question 6

Temperate viruses:

Accepted Answer

A)  always destroy their host immediately. 
B)  are considered virulent. 
C)  do not always destroy their host. 
D)  do not undergo a lysogenic cycle. 
E)  undergo a lytic cycle. 
A)  always destroy their host immediately. 
B)  are considered virulent. 
C)  do not always destroy their host. 
D)  do not undergo a lysogenic cycle. 
E)  undergo a lytic cycle.

Question 7

MATCHING
Match the virus group with nucleic acid description
a.ssRNA that can serve as mRNA ; enveloped viruses
d.dsDNA : nonenveloped virus
b.ssRNA enveloped viruses;contains reverse transcriptase for transcription of RNA into DNA; two identical molecules ssRNA
e.dsDNA: large complex enveloped virus virus; replicates in host nucleus
c.ssRNA that serves as template for mRNA synthesis ; medium sized enveloped that often exhibit projecting spikes
-Describe the theory that attempts to explain the species specificity of viruses to their hosts.

Accepted Answer

Concepts to Consider: Viruses may have c

Question 8

Viruses that attack bacteria are called:

Accepted Answer

A)  phages. 
B)  bacteriods 
C)  prions. 
D)  virons. 
E)  viroids. 
A)  phages. 
B)  bacteriods 
C)  prions. 
D)  virons. 
E)  viroids.

Question 9

Phages are being considered for:

Accepted Answer

A)  vectors in gene therapy experiments. 
B)  antibiotics in bacterial infections. 
C)  gene transfer vectors in animal cells. 
D)  being equivalent to the first living organisms. 
E)  All of the above. 
A)  vectors in gene therapy experiments. 
B)  antibiotics in bacterial infections. 
C)  gene transfer vectors in animal cells. 
D)  being equivalent to the first living organisms. 
E)  All of the above.

Question 10

Virulent (lytic) phages:

Accepted Answer

A)  infect viruses. 
B)  destroy bacteria. 
C)  infect but do not destroy bacteria. 
D)  infect virions. 
E)  infect prions. 
A)  infect viruses. 
B)  destroy bacteria. 
C)  infect but do not destroy bacteria. 
D)  infect virions. 
E)  infect prions.

Question 11

Retroviruses differ from other RNA viruses by:

Accepted Answer

A)  having reverse transcriptase instead of RNA-dependent RNA polymerase. 
B)  the shape of their capsid. 
C)  the way they infect their host cells. 
D)  the sugar coating on their capsids. 
E)  lytically destroying their hosts. 
A)  having reverse transcriptase instead of RNA-dependent RNA polymerase. 
B)  the shape of their capsid. 
C)  the way they infect their host cells. 
D)  the sugar coating on their capsids. 
E)  lytically destroying their hosts.

Question 12

The immunodeficiency virus that causes acquired immunodeficiency syndrome is an enveloped virus.
____________________

Accepted Answer

A) True 
 B)False

Question 13

MATCHING
Match the virus group with nucleic acid description
a.ssRNA that can serve as mRNA ; enveloped viruses
d.dsDNA : nonenveloped virus
b.ssRNA enveloped viruses;contains reverse transcriptase for transcription of RNA into DNA; two identical molecules ssRNA
e.dsDNA: large complex enveloped virus virus; replicates in host nucleus
c.ssRNA that serves as template for mRNA synthesis ; medium sized enveloped that often exhibit projecting spikes
-Herpesviruses

Accepted Answer

The answer of MATCHING
Match the virus group with nucleic acid...

Question 14

Viroids cause a variety of plant diseases and are composed only of:

Accepted Answer

A)  strands of RNA. 
B)  strands of DNA. 
C)  protein coats. 
D)  peptidoglycan. 
E)  a capsid. 
A)  strands of RNA. 
B)  strands of DNA. 
C)  protein coats. 
D)  peptidoglycan. 
E)  a capsid.

Question 15

Which of the following identifies a group of DNA viruses?

Accepted Answer

A)  retroviruses 
B)  herpesviruses 
C)  paramyxoviruses 
D)  filovirus 
E)  picornaviruses 
A)  retroviruses 
B)  herpesviruses 
C)  paramyxoviruses 
D)  filovirus 
E)  picornaviruses

Question 16

Viruses are classified by:

Accepted Answer

A)  the sequence of their DNA. 
B)  structural similarities. 
C)  the sequence of their rRNA genes. 
D)  the traditional Linnaean binomial nomenclature system. 
E)  an international committee. 
A)  the sequence of their DNA. 
B)  structural similarities. 
C)  the sequence of their rRNA genes. 
D)  the traditional Linnaean binomial nomenclature system. 
E)  an international committee.

Question 17

Viruses:

Accepted Answer

A)  are very tiny cells on the order of 500 nm. 
B)  contain both RNA and DNA. 
C)  cannot independently perform metabolic activities. 
D)  have a standard morphology that includes a capsid, tail, and tail fibers. 
E)  have nuclei. 
A)  are very tiny cells on the order of 500 nm. 
B)  contain both RNA and DNA. 
C)  cannot independently perform metabolic activities. 
D)  have a standard morphology that includes a capsid, tail, and tail fibers. 
E)  have nuclei.

Question 18

A virus consists of a DNA or RNA core surrounded by a(n) envelope.
____________________

Accepted Answer

A) True 
 B)False

Question 19

MATCHING
Match the virus group with nucleic acid description
a.ssRNA that can serve as mRNA ; enveloped viruses
d.dsDNA : nonenveloped virus
b.ssRNA enveloped viruses;contains reverse transcriptase for transcription of RNA into DNA; two identical molecules ssRNA
e.dsDNA: large complex enveloped virus virus; replicates in host nucleus
c.ssRNA that serves as template for mRNA synthesis ; medium sized enveloped that often exhibit projecting spikes
-Papovaviruses

Accepted Answer

The answer of MATCHING
Match the virus group with nucleic acid...

Question 20

Human viruses can enter human cells by fusion with the cell membrane or by:

Accepted Answer

A)  diffusion into the cell. 
B)  passage through specific protein channels. 
C)  coating themselves with lipids that cloak their entrance into the cell. 
D)  endocytosis. 
E)  hitchhiking onto protein signals entering the cell. 
A)  diffusion into the cell. 
B)  passage through specific protein channels. 
C)  coating themselves with lipids that cloak their entrance into the cell. 
D)  endocytosis. 
E)  hitchhiking onto protein signals entering the cell.

Exam 24: Viruses and Subviral Agents

The five stages of a lytic infection are attachment, penetration, __________, assembly, and release.

__________ conversion occurs when a bacterium carrying viral genes takes on new, atypical characteristics.

Which of the following diseases is not caused by a virus?

The specificity of viruses to different types of cells is due to __________ sites on the host cell.

Temperate viruses:

Viruses that attack bacteria are called:

Phages are being considered for:

Virulent (lytic) phages:

Retroviruses differ from other RNA viruses by:

The immunodeficiency virus that causes acquired immunodeficiency syndrome is an enveloped virus. ____________________

Viroids cause a variety of plant diseases and are composed only of:

Which of the following identifies a group of DNA viruses?

Viruses are classified by:

Viruses:

A virus consists of a DNA or RNA core surrounded by a(n) envelope. ____________________

Human viruses can enter human cells by fusion with the cell membrane or by:

A View of Life

Atoms and Molecules: the Chemical Basis of Life

The Chemistry of Life: Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp: Energy-Releasing Pathways

Photosynthesis: Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna: the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity: Systematics

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure, Growth, and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function: an Introduction

Protection, Support, and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System: Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology: Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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