|
How do all viruses differ from bacteria? |
viruses are not composed of cells |
|
Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals? |
they cannot reproduce themselves outside a host |
|
Which of the following statements about viral spikes is FALSE? |
they are found only on noenveloped viruses |
|
Which of the following is NOT used as a criterion to classify viruses? |
biochemical tests |
|
Which of the following is NOT utilized to culture viruses? |
culture media |
|
Bacteriophages and animal viruses do NOT differ significantly in which one of the following steps? |
biosynthesis |
|
The definition of lysogeny is |
phage DNA is incorporated into the host cell DNA |
|
A viroid is a (n) |
infectious piece of RNA without a capsid |
|
In figure 13.1, which structure is a complex virus? |
b |
|
The structures illustrated in figure 13.1 are composed of |
capsomeres |
|
A clear area against a confluent "lawn" of bacteria is called a |
plaque |
|
Continuous cell lines differ from primary cell lines in that |
continuous cell lines can be maintained through an indefinite number of generations |
|
Which of the following is necessary for replication of a prion? |
PrPSc |
|
A persistent infection is one in which |
the disease process occurs gradually over a long period |
|
Which of the following statements is FALSE? |
the prophage makes the host cell immune to infection by other phages |
|
Which of the following would be the first step in biosynthesis of a virus with a -(minus) strand of RNA |
synthesis of double-stranded RNA from an RNA templete |
|
An infectious protein is a |
prion |
|
An envelope is acquired during which of the following steps? |
release |
|
Which of the following statements is NOT true of lysogeny? |
its causes lysis of host cells |
|
An example of a latent viral infection is |
cold sores |
|
A virus’s ability to infect an animal cell depends primarily upon the |
presence of receptor sites on the cell membrance |
|
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? |
togavirus |
|
The mechanism whereby an enveloped virus leaves a host cell is called |
budding |
|
The most conclusive evidence that viruses cause cancers is provided by |
cancer following injection of cell-free filtrates |
|
Bacteriophages derive all of the following from the host cell EXCEPT |
lysozyme |
|
Bacteriophage replication differs from animal virus replication because only bacteriophage replication involes |
injection of naked nucleic acid into the host cell |
|
Generally, in an infection caused by a DNA-containing virus, the host animal cell supplies all of the following EXCEPT |
DNA polymerase |
|
Which of the following places these items in the correct order for DNA-virus replication? |
2;3;4;1 |
|
A viral species is a group of viruses that |
has the same genetic information and ecological niche |
|
Viruses that utilize reverse transcriptase belong to the virus families |
hepadnaviridae and retroviridae |
|
DNA made from RNA template will be incorporated into the virus capsid of |
hepadnaviridae |
|
Which of the following statements about viruses is FALSE? |
viruses use their own catabolic enzymes |
|
A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient? |
the virus is causing the death of the infected cells in the patient |
|
Same viruses, such as human herpesvirus 1, infect a cell without causing symptoms, These are called |
latent viruses |
|
The following steps occur during multiplication of retroviruses. Which is the fourth step? |
synthesis of double-stranded DNA |
|
Oncogenic viruses |
cause tumors to develop |
|
Which one of the following steps does NOT occur during multiplication of a picornavirus? |
synthesis of DNA |
|
Which of the following is most likely a product of an early gene? |
DNA polymerase |
|
Most RNA viruses carry which of the following enzymes? |
RNA-dependent RNA polymerase |
|
The following steps occur during biosynthesis of a + strand RNA virus. What is the third step? |
synthesis of -strand RNA |
|
What contributes to antigenic shift in influenza viruses? |
a segmented genome |
Share This
Flashcard
