Question 1

One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a(n) _____
capsid.

Accepted Answer

icosahedral

Question 2

Oncogenic viruses include all the following except

Accepted Answer

A) Hepatitis B virus. 
B) Measles virus. 
C) Papillomavirus. 
D) HTLVI and HTLVII viruses. 
E) Epstein-Barr virus. 
A) Hepatitis B virus. 
B) Measles virus. 
C) Papillomavirus. 
D) HTLVI and HTLVII viruses. 
E) Epstein-Barr virus. B

Question 3

Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?

Accepted Answer

A) enveloped virus 
B) RNA virus 
C) nonenveloped virus 
D) DNA virus 
A) enveloped virus 
B) RNA virus 
C) nonenveloped virus 
D) DNA virus C

Question 4

Clostridium botulinum is made virulent by incorporated prophage genes encoding the botulinum toxin.What term describes this process?

Accepted Answer

A) lytic phase 
B) budding 
C) adsorption 
D) lysogenic conversion 
E) latent phase 
A) lytic phase 
B) budding 
C) adsorption 
D) lysogenic conversion 
E) latent phase

Question 5

Discuss at least six characteristics that are unique to viruses compared to other microorganisms.

Accepted Answer

1. Non-cellular structure: Unlike other

Question 6

Host cells of viruses include

Accepted Answer

A) human and other animals. 
B) plants and fungi. 
C) bacteria. 
D) protozoa and algae. 
E) All of these choices are correct. 
A) human and other animals. 
B) plants and fungi. 
C) bacteria. 
D) protozoa and algae. 
E) All of these choices are correct.

Question 7

A(n) _____ is the protein shell around the nucleic acid core of a virus.

Accepted Answer

The answer of A(n) _____ is the protein shell around...

Question 8

Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

Accepted Answer

A) True 
 B)False

Question 9

Viral infections are easier to treat with drugs than bacterial infections.

Accepted Answer

A) True 
 B)False

Question 10

The correct sequence of events in viral multiplication is

Accepted Answer

A) penetration, replication, maturation, adsorption, assembly, release. 
B) replication, penetration, maturation, assembly, absorption, release. 
C) adsorption, penetration, replication, maturation, assembly, release. 
D) assembly, maturation, replication, release, penetration, adsorption. 
E) adsorption, release, maturation, replication, assembly, penetration. 
A) penetration, replication, maturation, adsorption, assembly, release. 
B) replication, penetration, maturation, assembly, absorption, release. 
C) adsorption, penetration, replication, maturation, assembly, release. 
D) assembly, maturation, replication, release, penetration, adsorption. 
E) adsorption, release, maturation, replication, assembly, penetration.

Question 11

Which of the following viruses did D.Ivanowski and M.Beijerinck work with?

Accepted Answer

A) Rabies 
B) Smallpox 
C) Tobacco Mosaic Virus 
D) Herpes 
E) Epstein-Barr virus 
A) Rabies 
B) Smallpox 
C) Tobacco Mosaic Virus 
D) Herpes 
E) Epstein-Barr virus

Question 12

When a virus enters a lysogenic phase, it means

Accepted Answer

A) the virus is integrated into the DNA of the host cell and is latent. 
B) the virus is bursting through the host cell membrane. 
C) the virus is starting biosynthesis of its nucleic acid. 
D) the virus will remain in circulation and not continue infecting its host. 
E) the number of viruses in the host is decreasing as the immune system becomes effective. 
A) the virus is integrated into the DNA of the host cell and is latent. 
B) the virus is bursting through the host cell membrane. 
C) the virus is starting biosynthesis of its nucleic acid. 
D) the virus will remain in circulation and not continue infecting its host. 
E) the number of viruses in the host is decreasing as the immune system becomes effective.

Question 13

A naked virus does not have a(n) _____.

Accepted Answer

The answer of A naked virus does not have a(n)...

Question 14

Noneveloped viruses enter their animal host cell via an active process that requires the participation of the animal cell.

Accepted Answer

A) True 
 B)False

Question 15

Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a _____ cell culture.

Accepted Answer

The answer of Freshly isolated animal tissue that is placed...

Question 16

Which body system is mainly affected by Creutzfeldt-Jakob disease?

Accepted Answer

A) digestive system 
B) genitourinary system 
C) nervous system 
D) circulatory system 
E) respiratory system 
A) digestive system 
B) genitourinary system 
C) nervous system 
D) circulatory system 
E) respiratory system

Question 17

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Accepted Answer

A) lysogeny. 
B) budding. 
C) plaques. 
D) cytopathic effect. 
E) pocks. 
A) lysogeny. 
B) budding. 
C) plaques. 
D) cytopathic effect. 
E) pocks.

Question 18

T-even phages

Accepted Answer

A) include the poxviruses. 
B) infect Escherichia coli cells. 
C) enter host cells by engulfment. 
D) have helical capsids. 
E) All of these choices are correct. 
A) include the poxviruses. 
B) infect Escherichia coli cells. 
C) enter host cells by engulfment. 
D) have helical capsids. 
E) All of these choices are correct.

Question 19

All of the following are characteristics of viruses except

Accepted Answer

A) they can be crystallized. 
B) they often have a geometric capsid. 
C) they have a viscous fluid inside their capsids. 
D) they can cause fatal diseases. 
E) they can cause mild diseases. 
A) they can be crystallized. 
B) they often have a geometric capsid. 
C) they have a viscous fluid inside their capsids. 
D) they can cause fatal diseases. 
E) they can cause mild diseases.

Question 20

What tool or technique used by Ivanowski and Beijerinck while studying diseased tobacco plants enabled them to determine that the disease was caused by an agent significantly smaller than bacteria?

Accepted Answer

A) scanning electron microscopy that enabled them to view the virus the tobacco mosaic virus 
B) transmission electron microscopy that allowed them to view the tobacco mosaic virus 
C) porcelain filters that trapped bacteria but allowed passage of the virus 
D) cell culture that enabled cultivation of the virus 
A) scanning electron microscopy that enabled them to view the virus the tobacco mosaic virus 
B) transmission electron microscopy that allowed them to view the tobacco mosaic virus 
C) porcelain filters that trapped bacteria but allowed passage of the virus 
D) cell culture that enabled cultivation of the virus

Exam 6: An Introduction to Viruses

One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a(n) _____ capsid.

Oncogenic viruses include all the following except

Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?

Clostridium botulinum is made virulent by incorporated prophage genes encoding the botulinum toxin.What term describes this process?

Discuss at least six characteristics that are unique to viruses compared to other microorganisms.

Host cells of viruses include

A(n) _____ is the protein shell around the nucleic acid core of a virus.

Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

Viral infections are easier to treat with drugs than bacterial infections.

The correct sequence of events in viral multiplication is

Which of the following viruses did D.Ivanowski and M.Beijerinck work with?

When a virus enters a lysogenic phase, it means

A naked virus does not have a(n) _____.

Noneveloped viruses enter their animal host cell via an active process that requires the participation of the animal cell.

Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a _____ cell culture.

Which body system is mainly affected by Creutzfeldt-Jakob disease?

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

T-even phages

All of the following are characteristics of viruses except

What tool or technique used by Ivanowski and Beijerinck while studying diseased tobacco plants enabled them to determine that the disease was caused by an agent significantly smaller than bacteria?

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods of Studying Microorganisms

A Survey of Prokaryotic Cells and Microorganisms

A Survey of Eukaryotic Cells and Microorganisms

Microbial Nutrition, Ecology, and Growth

An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering: a Revolution in Molecular Biology

Physical and Chemical Agents for Microbial Control

Drugs, Microbes, Host--The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

An Introduction to Host Defenses and Innate Immunities

Adaptive, Specific Immunity and Immunization

Disorders in Immunity

Procedures for Identifying Pathogens and Diagnosing Infections

The Gram-Positive and Gram-Negative Cocci of Medical Importance

The Gram-Positive Bacilli of Medical Importance

The Gram-Negative Bacilli of Medical Importance

Miscellaneous Bacterial Agents of Disease

The Fungi of Medical Importance

The Parasites of Medical Importance

Introduction to Viruses That Infect Humans: the Dna Viruses

The Rna Viruses That Infect Humans

Environmental Microbiology

Applied and Industrial Microbiology

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