Microbiology - Chapter 13

Most viruses cannot be seen by light microscopy
True
During the intracellular state, a virus exists as
A nucleic acid
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Is a mechanism of release for enveloped viruses
Budding
Assembly of new viruses is a process that usually requires the direction of a variety of viral and cellular enzymes
False
Which of the following events occurs in the lytic cycle of bacteriophage T4 infection but not in the lysogenic cycle
Digestion of host DNA
Which of the following statements regarding taxonomy is true
Some virus family names are derived from the name of an important member of the family
Protozoa are susceptible to viral attack
True
Viral infection results in cancer in the process of
Oncogenesis
How are prions different from all other known infectious agents
They lack nucleic acid
Proteins are present in
Both cells and viruses
Which of the following individuals discovered prions
Prusiner
Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated
-ssRNA viruses
How are fungal viruses different from viruses that infect other organisms
They have no extracellular state
Diploid cell cultures and continuous cell cultures differ in which of the following ways
Longevity and source of cells
Poxvirus is assembled in the cytoplasm of the cell instead of in the nucleus, as in the case for the majority of dsDNA viruses
True
Which of the following membranes can give rise to a viral envelope
The nuclear and cytoplasmic membranes and the endoplasmic reticulum
In contrast to most dsDNA animal viruses, the poxviruses replicate solely in the cytoplasm of the host cell. This fact implies that the viral genome may encode
A DNA polymerase
Viroids infect
Plants
The genome of which of the following types of animal virus can act directly as mRNA
+ssRNA viruses
A lipid membrane is present
In both cells and viruses
Viruses cause most human cancers
False
The outermost layer of a virion fulfills which of the following functions of the virus
Protection and recognition
Which of the following is associated with the attachment of a bacteriophage to a bacterial cell
Random collisions, chemical attractions, and receptor specificity
The infectious particles of fungi have RNA genomes and lack a capsid. They are therefore similar to
Viroids
Double-stranded RNA genomes can be found
Only in viruses
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