Question 1

Which of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA?

Accepted Answer

A)  transcription of mRNA from DNA 
B)  synthesis of double-stranded RNA from a DNA template 
C)  synthesis of DNA from an RNA template 
D)  synthesis of double-stranded RNA from an RNA template 
E)  synthesis of DNA from a DNA template 
A)  transcription of mRNA from DNA 
B)  synthesis of double-stranded RNA from a DNA template 
C)  synthesis of DNA from an RNA template 
D)  synthesis of double-stranded RNA from an RNA template 
E)  synthesis of DNA from a DNA template

Question 2

Figure 13.2
  
-Assume a patient had chickenpox (human herpesvirus 3) as a child. Which line on the graph in Figure 13.2 would show the number of viruses present in this person as a 60 -year-old with shingles (human herpesvirus 3)?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
E)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 3

An example of a latent viral infection is

Accepted Answer

A)  cold sores. 
B)  mumps. 
C)  subacute sclerosing panencephalitis. 
D)  smallpox. 
E)  influenza. 
A)  cold sores. 
B)  mumps. 
C)  subacute sclerosing panencephalitis. 
D)  smallpox. 
E)  influenza.

Question 4

A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid.

Accepted Answer

A) True 
 B)False

Question 5

The most conclusive evidence that viruses cause cancers is provided by

Accepted Answer

A)  finding oncogenes in viruses. 
B)  some liver cancer patients having had hepatitis. 
C)  cancer following injection of cell-free filtrates. 
D)  the presence of antibodies against viruses in cancer patients. 
E)  treating cancer with antibodies. 
A)  finding oncogenes in viruses. 
B)  some liver cancer patients having had hepatitis. 
C)  cancer following injection of cell-free filtrates. 
D)  the presence of antibodies against viruses in cancer patients. 
E)  treating cancer with antibodies.

Question 6

Positive sense RNA strands of viruses are treated like mRNA inside the host cell.

Accepted Answer

A) True 
 B)False

Question 7

Helical and icosahedral are terms used to describe the shapes of a virus envelope.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements is NOT true of lysogeny?

Accepted Answer

A)  It can give infected pathogens the genetic information for toxin production. 
B)  It is a ʺsilentʺ infection; the virus does not replicate. 
C)  Lytic cycle may follow lysogeny. 
D)  Prophage is inserted into the host genome. 
E)  It causes lysis of host cells. 
A)  It can give infected pathogens the genetic information for toxin production. 
B)  It is a ʺsilentʺ infection; the virus does not replicate. 
C)  Lytic cycle may follow lysogeny. 
D)  Prophage is inserted into the host genome. 
E)  It causes lysis of host cells.

Question 9

Bacteriophages derive all of the following from the host cell EXCEPT

Accepted Answer

A)  tRNA. 
B)  lysozyme. 
C)  nucleotides. 
D)  amino acids. 
E)  ATP. 
A)  tRNA. 
B)  lysozyme. 
C)  nucleotides. 
D)  amino acids. 
E)  ATP.

Question 10

Figure 13.2
  
-Assume a patient has influenza. During which time on the graph in Figure 13.2 would the patient show the symptoms of the illness?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
E)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 11

Bacteriophages and animal viruses do NOT differ significantly in which one of the following steps?

Accepted Answer

A)  attachment 
B)  uncoating 
C)  biosynthesis 
D)  penetration 
E)  release 
A)  attachment 
B)  uncoating 
C)  biosynthesis 
D)  penetration 
E)  release

Question 12

Oncogenic viruses

Accepted Answer

A)  have no effect on the host cell. 
B)  cause acute infections. 
C)  are genetically unstable. 
D)  cause tumors to develop. 
E)  are lytic viruses that kill the host cell. 
A)  have no effect on the host cell. 
B)  cause acute infections. 
C)  are genetically unstable. 
D)  cause tumors to develop. 
E)  are lytic viruses that kill the host cell.

Question 13

Which of the following is most likely a product of an early gene?

Accepted Answer

A)  envelope proteins 
B)  spike proteins 
C)  capsid proteins 
D)  DNA polymerase 
E)  lysozyme 
A)  envelope proteins 
B)  spike proteins 
C)  capsid proteins 
D)  DNA polymerase 
E)  lysozyme

Question 14

Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong?

Accepted Answer

A)  togavirus 
B)  retrovirus 
C)  picornavirus 
D)  herpesvirus 
E)  papovavirus 
A)  togavirus 
B)  retrovirus 
C)  picornavirus 
D)  herpesvirus 
E)  papovavirus

Question 15

A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient?

Accepted Answer

A)  The virus is infecting cells and then releasing only small amounts of virus. 
B)  The virus is incorporating its nucleic acid with that of the patientʹs cells. 
C)  The virus is slowly killing the patientʹs cells. 
D)  The virus is causing the death of the infected cells in the patient. 
E)  The virus is not killing any cells in the host. 
A)  The virus is infecting cells and then releasing only small amounts of virus. 
B)  The virus is incorporating its nucleic acid with that of the patientʹs cells. 
C)  The virus is slowly killing the patientʹs cells. 
D)  The virus is causing the death of the infected cells in the patient. 
E)  The virus is not killing any cells in the host.

Question 16

A virusʹs ability to infect an animal cell depends primarily upon the

Accepted Answer

A)  presence of pili on the host cell wall. 
B)  enzymatic activity of a host cell. 
C)  host cellʹs ability to phagocytize viral particles. 
D)  presence of receptor sites on the cell membrane. 
E)  type of viral nucleic acid. 
A)  presence of pili on the host cell wall. 
B)  enzymatic activity of a host cell. 
C)  host cellʹs ability to phagocytize viral particles. 
D)  presence of receptor sites on the cell membrane. 
E)  type of viral nucleic acid.

Exam 13: Viruses, Viroids, and Prions

Which of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA?

Figure 13.2 -Assume a patient had chickenpox (human herpesvirus 3) as a child. Which line on the graph in Figure 13.2 would show the number of viruses present in this person as a 60 -year-old with shingles (human herpesvirus 3)?

An example of a latent viral infection is

A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid.

The most conclusive evidence that viruses cause cancers is provided by

Positive sense RNA strands of viruses are treated like mRNA inside the host cell.

Helical and icosahedral are terms used to describe the shapes of a virus envelope.

Which of the following statements is NOT true of lysogeny?

Bacteriophages derive all of the following from the host cell EXCEPT

Figure 13.2 -Assume a patient has influenza. During which time on the graph in Figure 13.2 would the patient show the symptoms of the illness?

Bacteriophages and animal viruses do NOT differ significantly in which one of the following steps?

Oncogenic viruses

Which of the following is most likely a product of an early gene?

Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong?

A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient?

A virusʹs ability to infect an animal cell depends primarily upon the

The Microbial World and You

Chemical Principles

Observing Microorganisms Through a Microscope

Functional Anatomy of Prokaryotic and Eukaryotic Cells

Microbial Metabolism

Microbial Growth

The Control of Microbial Growth

Microbial Genetics

Biotechnology and Dna Technology

Classification of Microorganisms

The Prokaryotes: Domains Bacteria and Archaea

The Eukaryotes: Fungi, Algae, Protozoa, and Helminths

Principles of Disease and Epidemiology

Microbial Mechanisms of Pathogenicity

Adaptive Immunity: Specific Defenses of the Host

Practical Applications of Immunology

Disorders Associated With the Immune System

Antimicrobial Drugs

Microbial Diseases of the Skin and Eyes

Microbial Diseases of the Nervous System

Microbial Diseases of the Cardiovascular and Lymphatic Systems

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Disease of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

Innate Immunity: Nonspecific Defenses of the Host

Filters