Question 1

Viral growth in bird embryos can cause discrete,opaque spots in the embryonic membranes called

Accepted Answer

A) patches. 
B) buds. 
C) plaques. 
D) cytopathic effects. 
E) pocks. 
A) patches. 
B) buds. 
C) plaques. 
D) cytopathic effects. 
E) pocks. E

Question 2

Mammalian viruses capable of starting tumors are

Accepted Answer

A) chronic latent viruses. 
B) oncoviruses. 
C) syncytia. 
D) inclusion bodies. 
E) cytopathic. 
A) chronic latent viruses. 
B) oncoviruses. 
C) syncytia. 
D) inclusion bodies. 
E) cytopathic. B

Question 3

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase.Select which step of virus multiplication that would be directly blocked by this mechanism:

Accepted Answer

A) adsorption 
B) penetration 
C) synthesis 
D) assembly 
E) release 
A) adsorption 
B) penetration 
C) synthesis 
D) assembly 
E) release C

Question 4

Host range is limited by

Accepted Answer

A) type of nucleic acid in the virus. 
B) age of the host cell. 
C) type of host cell receptors on cell membrane. 
D) size of the host cell. 
A) type of nucleic acid in the virus. 
B) age of the host cell. 
C) type of host cell receptors on cell membrane. 
D) size of the host cell.

Question 5

Viruses are not filterable.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is not associated with every virus?

Accepted Answer

A) envelope 
B) capsomeres 
C) capsid 
D) nucleic acid 
E) genome 
A) envelope 
B) capsomeres 
C) capsid 
D) nucleic acid 
E) genome

Question 7

Which of the following is incorrect about prophages?

Accepted Answer

A) present when the virus is in lysogeny 
B) formed when viral DNA enters the bacterial chromosome 
C) replicated with host DNA and passed on to progeny 
D) cause lysis of host cells 
E) occur when temperate phages enter host cells 
A) present when the virus is in lysogeny 
B) formed when viral DNA enters the bacterial chromosome 
C) replicated with host DNA and passed on to progeny 
D) cause lysis of host cells 
E) occur when temperate phages enter host cells

Question 8

The core of every virus particle always contains

Accepted Answer

A) DNA. 
B) capsomeres. 
C) enzymes. 
D) DNA and RNA. 
E) either DNA or RNA. 
A) DNA. 
B) capsomeres. 
C) enzymes. 
D) DNA and RNA. 
E) either DNA or RNA.

Question 9

Two noncellular agents,smaller than viruses,are infectious proteins called _____ and infectious RNA strands called _____.

Accepted Answer

A) prions;capsomeres 
B) virions;prions 
C) viroids;phages 
D) prions;phages 
E) prions;viroids 
A) prions;capsomeres 
B) virions;prions 
C) viroids;phages 
D) prions;phages 
E) prions;viroids

Question 10

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

Accepted Answer

A) adsorption to the host cells. 
B) injection of only the viral nucleic acid into the host cell. 
C) host cell synthesis of viral enzymes and capsid proteins. 
D) assembly of nucleocapsids. 
E) replication of viral nucleic acid. 
A) adsorption to the host cells. 
B) injection of only the viral nucleic acid into the host cell. 
C) host cell synthesis of viral enzymes and capsid proteins. 
D) assembly of nucleocapsids. 
E) replication of viral nucleic acid.

Question 11

Viruses are used to produce vaccines for prevention of certain viral infections.

Accepted Answer

A) True 
 B)False

Question 12

Viruses acquire envelopes around their nucleocapsids during

Accepted Answer

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

Question 13

Select the statement that most accurately describes the action of antimicrobial drugs today.

Accepted Answer

A) Antiviral drug treatment is more effective than vaccination against a viral disease. 
B) Effective antiviral drugs have a long history of development and use. 
C) Antiviral drugs often result in toxic side effects due to their inhibition of host cell activity. 
D) The development of antiviral drug resistance has not been observed,as compared to the high rate of antibiotic resistance seen today. 
A) Antiviral drug treatment is more effective than vaccination against a viral disease. 
B) Effective antiviral drugs have a long history of development and use. 
C) Antiviral drugs often result in toxic side effects due to their inhibition of host cell activity. 
D) The development of antiviral drug resistance has not been observed,as compared to the high rate of antibiotic resistance seen today.

Question 14

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Accepted Answer

A) True 
 B)False

Question 15

Some animals can become infected with multiple influenza virus strains usually associated with other animals.Which statement below describes the result of these infections?

Accepted Answer

A) A new novel strain of flu may be produced,for which the human population has no immunity. 
B) Major genetic variations in the flu viruses can be reproduced. 
C) The viral genomes within the host cells can become recombined. 
D) All of the above are possible outcomes. 
A) A new novel strain of flu may be produced,for which the human population has no immunity. 
B) Major genetic variations in the flu viruses can be reproduced. 
C) The viral genomes within the host cells can become recombined. 
D) All of the above are possible outcomes.

Question 16

Viruses with _____-sense RNA contain the correct message for translation,while viruses with _____-sense RNA must first be converted into a correct message.

Accepted Answer

A) positive;negative 
B) negative;positive 
C) primary;secondary 
D) secondary;primary 
E) intermediate;primary 
A) positive;negative 
B) negative;positive 
C) primary;secondary 
D) secondary;primary 
E) intermediate;primary

Question 17

Which of the following is not a typical capsid shape?

Accepted Answer

A) tetrahedral 
B) complex 
C) helical 
D) icosahedron 
E) viroid. 
A) tetrahedral 
B) complex 
C) helical 
D) icosahedron 
E) viroid.

Question 18

Viral nucleic acid types include:

Accepted Answer

A) double-stranded DNA 
B) single-stranded DNA 
C) double-stranded RNA 
D) single-stranded RNA 
E) All of the choices are correct. 
A) double-stranded DNA 
B) single-stranded DNA 
C) double-stranded RNA 
D) single-stranded RNA 
E) All of the choices are correct.

Question 19

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Accepted Answer

A) embryo 
B) cell 
C) plaque 
D) bacteriophage 
E) egg 
A) embryo 
B) cell 
C) plaque 
D) bacteriophage 
E) egg

Question 20

The correct sequence of events in viral multiplication is:

Accepted Answer

A) penetration,uncoating,synthesis,adsorption,assembly,release 
B) uncoating,penetration,synthesis,assembly,absorption,release 
C) adsorption,penetration,uncoating,synthesis,assembly,release 
D) assembly,synthesis,uncoating,release,penetration,adsorption 
E) adsorption,release,synthesis,uncoating,assembly,penetration 
A) penetration,uncoating,synthesis,adsorption,assembly,release 
B) uncoating,penetration,synthesis,assembly,absorption,release 
C) adsorption,penetration,uncoating,synthesis,assembly,release 
D) assembly,synthesis,uncoating,release,penetration,adsorption 
E) adsorption,release,synthesis,uncoating,assembly,penetration

Exam 6: An Introduction to the Viruses

Viral growth in bird embryos can cause discrete,opaque spots in the embryonic membranes called

Mammalian viruses capable of starting tumors are

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase.Select which step of virus multiplication that would be directly blocked by this mechanism:

Host range is limited by

Viruses are not filterable.

Which of the following is not associated with every virus?

Which of the following is incorrect about prophages?

The core of every virus particle always contains

Two noncellular agents,smaller than viruses,are infectious proteins called _____ and infectious RNA strands called _____.

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

Viruses are used to produce vaccines for prevention of certain viral infections.

Viruses acquire envelopes around their nucleocapsids during

Select the statement that most accurately describes the action of antimicrobial drugs today.

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Some animals can become infected with multiple influenza virus strains usually associated with other animals.Which statement below describes the result of these infections?

Viruses with _____-sense RNA contain the correct message for translation,while viruses with _____-sense RNA must first be converted into a correct message.

Which of the following is not a typical capsid shape?

Viral nucleic acid types include:

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

The correct sequence of events in viral multiplication is:

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Prokaryotic Profiles: The Bacteria and Archaea

Eukaryotic Cells and Microorganisms

Microbial Nutrition, Ecology, and Growth

Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering and Recombinant Dna

Physical and Chemical Control of Microbes

Drugs, Microbes, host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

Filters

Two noncellular agents,smaller than viruses,are infectious proteins called _ and infectious RNA strands called _.

Viruses with _-sense RNA contain the correct message for translation,while viruses with _-sense RNA must first be converted into a correct message.