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How do all viruses differ from bacteria? |
Viruses are not composed of cells. |
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Which of the following statements about viruses is FALSE? -Viruses contain DNA or RNA but never both. |
Viruses use their own catabolic enzymes. |
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True or False Most drugs that interfere with viral multiplication also interfere with host cell function. |
True |
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True or False: Glycoprotein spikes are found on the capsids of all viruses. |
False |
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What is NOT utilized to culture viruses? -animal cell cultures |
culture media |
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An envelope is acquired during which of the following steps? |
release |
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Bacteriophage replication differs from animal virus replication because only bacteriophage replication involves |
injection of naked nucleic acid into the host cell. |
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True or False The basic mechanism of viral multiplication is similar for all viruses. |
True |
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True or False Dogs do not get measles because their cells lack the correct receptor sites for that virus. |
True |
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What is the function of the structural elements of a virus? |
To package and protect the viral genome |
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Which virus is NOT associated with cancer? human papillomavirus (HPV) |
coronavirus (common cold virus) |
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A persistent infection is one in which |
the disease process occurs gradually over a long period. |
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True or False A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid. |
False |
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What disease does the human herpesvirus-1 cause? |
cold sores or fever blisters |
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Which statement is INCORRECT concerning animal viruses? -Retroviruses use an enzyme called reverse transcriptase, which synthesizes DNA using RNA as a template. |
The genome of animal viruses is always single-stranded. |
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Which of the following is true concerning a lysogenic viral replication cycle? |
During lysogeny, the viral genome integrates into the host DNA, becoming a physical part of the chromosome. |
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Each of the following can be used for the detection and/or identification of viruses except _____________ -serologic (immunologic) tests |
fermentation tests |
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Which of the following are the main causative agents of the common cold? -Coronaviruses and Streptococcus pneumoniae |
Rhinoviruses and coronaviruses |
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Which of the following types of macromolecules are found in all viruses? -Polysaccharides |
Proteins and nucleic acids |
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Lysogenic viral DNA which has integrated into the host genome is referred to as |
a prophage. |
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Which of the following events might trigger induction of a temperate bacteriophage? |
Exposure to UV light |
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How is the lytic cycle different from the lysogenic cycle with respect to the infected host cell? |
The host cell dies during the lytic stage. |
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What is the fate of the prophage during the lysogenic stage? |
It is copied every time the host DNA replicates. |
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In which stage does formation of mature viruses occur? |
Assembly |
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Which of the following is true regarding cultivation and isolation of animal viruses? |
Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host. |
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How does specialized transduction differ from regular lysogeny? |
The prophage in specialized transduction carries with it pieces of the host chromosomal DNA. |
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How can specialized transduction contribute to the transfer of antibiotic resistance genes in a bacterial population? |
The prophage takes an antibiotic resistance gene with it and is packaged with the newly synthesized viral DNA. |
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