Question 1

Which of the following is necessary for replication of a prion?

Accepted Answer

A)  RNA 
B)  DNA 
C)  lysozyme 
D)  DNA polymerase 
E)  PrPSc 
A)  RNA 
B)  DNA 
C)  lysozyme 
D)  DNA polymerase 
E)  PrPSc E

Question 2

Viruses that utilize reverse transcriptase belong to the virus families

Accepted Answer

A)  Herpesviridae and Poxviridae. 
B)  Rhabdoviridae and Herpesviridae. 
C)  Retroviridae and Picornaviridae. 
D)  Hepadnaviridae and Retroviridae. 
E)  Herpesviridae and Retroviridae. 
A)  Herpesviridae and Poxviridae. 
B)  Rhabdoviridae and Herpesviridae. 
C)  Retroviridae and Picornaviridae. 
D)  Hepadnaviridae and Retroviridae. 
E)  Herpesviridae and Retroviridae. D

Question 3

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

Accepted Answer

A) True 
 B)False  True

Question 4

The following steps occur during multiplication of herpesviruses. Which is the third step?

Accepted Answer

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

Question 5

An example of a latent viral infection is

Accepted Answer

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

Question 6

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 7

Figure 13.1
  
-In Figure 13.1, which structure is a complex virus?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
E)  All of the structures are complex viruses. 
A)  a 
B)  b 
C)  c 
D)  d 
E)  All of the structures are complex viruses.

Question 8

The basic mechanism of viral multiplication is similar for all viruses.

Accepted Answer

A) True 
 B)False

Question 9

Which one of the following steps does NOT occur during multiplication of a picornavirus?

Accepted Answer

A)  synthesis of - strands of RNA 
B)  synthesis of + strands of RNA 
C)  synthesis of viral proteins 
D)  synthesis of DNA 
E)  None of the answers is correct. 
A)  synthesis of - strands of RNA 
B)  synthesis of + strands of RNA 
C)  synthesis of viral proteins 
D)  synthesis of DNA 
E)  None of the answers is correct.

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

An envelope is acquired during which of the following steps?

Accepted Answer

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

Question 12

Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called

Accepted Answer

A)  slow viruses. 
B)  lytic viruses. 
C)  unconventional viruses. 
D)  phages. 
E)  latent viruses. 
A)  slow viruses. 
B)  lytic viruses. 
C)  unconventional viruses. 
D)  phages. 
E)  latent viruses.

Question 13

Bacteriophages derive all of the following from the host cell EXCEPT

Accepted Answer

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

Question 14

Which of the following statements about viruses is FALSE?

Accepted Answer

A)  Viruses contain a protein coat. 
B)  Viruses contain DNA or RNA but never both. 
C)  Viruses have genes. 
D)  Viruses use their own catabolic enzymes. 
E)  Viruses use the anabolic machinery of the cell. 
A)  Viruses contain a protein coat. 
B)  Viruses contain DNA or RNA but never both. 
C)  Viruses have genes. 
D)  Viruses use their own catabolic enzymes. 
E)  Viruses use the anabolic machinery of the cell.

Question 15

The mechanism whereby an enveloped virus leaves a host cell is called

Accepted Answer

A)  budding. 
B)  lysogeny. 
C)  penetration. 
D)  transduction. 
E)  abduction. 
A)  budding. 
B)  lysogeny. 
C)  penetration. 
D)  transduction. 
E)  abduction.

Question 16

A viroid is a(n)

Accepted Answer

A)  infectious protein. 
B)  provirus. 
C)  capsid without nucleic acid. 
D)  complete, infectious virus particle. 
E)  infectious piece of RNA without a capsid. 
A)  infectious protein. 
B)  provirus. 
C)  capsid without nucleic acid. 
D)  complete, infectious virus particle. 
E)  infectious piece of RNA without a capsid.

Question 17

Which of the following statements is FALSE?

Accepted Answer

A)  A prophage can "pop" out of the chromosome. 
B)  A prophage may result in new properties of the host cell. 
C)  A prophage is phage DNA inserted into a bacterial chromosome. 
D)  The prophage makes the host cell immune to infection by other phages. 
E)  Prophage genes are repressed by a repressor protein coded for by the prophage. 
A)  A prophage can "pop" out of the chromosome. 
B)  A prophage may result in new properties of the host cell. 
C)  A prophage is phage DNA inserted into a bacterial chromosome. 
D)  The prophage makes the host cell immune to infection by other phages. 
E)  Prophage genes are repressed by a repressor protein coded for by the prophage.

Question 18

Which of the following statments is NOT true of lysogeny?

Accepted Answer

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

Question 19

The most conclusive evidence that viruses cause cancers is provided by

Accepted Answer

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

Question 20

Viruses are the only known infectious agents that are obligatory intracellular parasites.

Accepted Answer

A) True 
 B)False

Exam 13: Viruses, Viroids, and Prions

Which of the following is necessary for replication of a prion?

Viruses that utilize reverse transcriptase belong to the virus families

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

The following steps occur during multiplication of herpesviruses. Which is the third step?

An example of a latent viral infection is

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)?

Figure 13.1 -In Figure 13.1, which structure is a complex virus?

The basic mechanism of viral multiplication is similar for all viruses.

Which one of the following steps does NOT occur during multiplication of a picornavirus?

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?

An envelope is acquired during which of the following steps?

Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called

Bacteriophages derive all of the following from the host cell EXCEPT

Which of the following statements about viruses is FALSE?

The mechanism whereby an enveloped virus leaves a host cell is called

A viroid is a(n)

Which of the following statements is FALSE?

Which of the following statments is NOT true of lysogeny?

The most conclusive evidence that viruses cause cancers is provided by

Viruses are the only known infectious agents that are obligatory intracellular parasites.

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 Recombinant Dna

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

Innate Immunity: Nonspecific Defenses of the Host

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 Diseases of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

Filters