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15 Cards in this Set
- Front
- Back
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Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals?
A) They are not composed of cells. B) They are filterable. C) They cannot reproduce themselves outside a host. D) They cause diseases similar to those caused by chemicals. E) They are chemically simple. |
C) They cannot reproduce themselves outside a host.
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Which of the following is NOT used as a criterion to classify viruses?
A) Biochemical tests B) Morphology C) Nucleic Acid D) Size E) Number of capsomeres |
A) Biochemical tests
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Bacteriophages and animal viruses do NOT differ signifantly in which of the following steps?
A) A) Adsorption B) B) Penetration C) C) Uncoating D) D) Biosynthesis E) E) Release |
D) D) Biosynthesis
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In lysogeny
A) A) Phage DNA is incorporated into host cell DNA. B) B) Lysis of the host cell occurs is due to phage replication and release. C) C) The burst time takes an unusually long time. D) D) The phage DNA is is NOT incorporated into the bacterial chromosome. E) E) The host cell is killed by the infection. |
A) A) Phage DNA is incorporated into host cell DNA.
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A viroid is
A) A) A complete, infectious virus particle. B) B) A nonenveloped, infectious piece of RNA. C) C) A capsid without a nucleic acid. D) D) A provirus. E) E) An infectious protein. |
B) B) A nonenveloped, infectious piece of RNA.
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A clear area against a confluent "lawn" of bacteria is called a
A) A) Phage. B) B) Pock. C) C) Cell lysis. D) D) Plaque. E) E) Rash. |
D) D) Plaque.
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Continuous cell lines differ from primary cell lines in that
A) A) Viruses can be grown in continuous cell lines. B) B) Continuous cell lines always have to be reisolated from animal tissue. C) C) Continuous cell lines are derived from primary cell cultures. D) D) Continuous cell lines are maintained through an indefinite number of generations. E) E) Continuous cells lines are from human embryos. |
D) D) Continuous cell lines are maintained through an indefinite number of generations.
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Which of the following is necessary for replication of a prion?
A) A) DNA B) B) DNA polymerase C) C) Lysozyme D) D) PrPSc (Sc is superscript) E) E) RNA |
D) D) PrPSc (Sc is superscript)
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A persistent infection is an infection in which
A) A) The virus remains in equilibrium with the host without causing disease. B) B) Viral replication is unusually slow. C) C) The disease process occurs gradually over a long period. D) D) Host cells are gradually lysed. E) E) Host cells are transformed. |
C) C) The disease process occurs gradually over a long period.
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Which of the following would be the first step in biosynthesis of a virus with a - strand of RNA?
A) A) Synthesis of DNA from and RNA template. B) B) Synthesis of double-stranded RNA from an RNA template. C) C) Synthesis of double-stranded RNA from a DNA template. D) D) Transcription fo mRNA from DNA. E) E) Synthesis of DNA from a DNA template. |
B) B) Synthesis of double-stranded RNA from an RNA template.
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An infectious protein is a
A) A) Bacteriophage. B) B) Prion C) C) Retrovirus. D) D) Viroid. E) E) Papilovirus. |
B) B) Prion
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An example of a latent viral infection is
A) A) Subacute sclerosing panencephalitis. B) B) Cold sores. C) C) Influenza. D) D) Smallpox. E) E) Mumps. |
B) B) Cold sores.
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Which of the following statements about viruses are false?
A) A) Viruses contain DNA or RNA but never both. B) B) Viruses contain a protein coat. C) C) Viruses use the anabolic machinery of the cell. D) D) Viruses use their own catabolic enzymes. E) E) Viruses have genes. |
D) D) Viruses use their own catabolic enzymes.
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Which of the following is most likely a product of an early gene?
A) A) Capsid proteins B) B) DNA polymerase C) C) Envelope proteins D) D) Spike proteins E) E) Lysozyme |
B) B) DNA polymerase
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What contributes the most to the antigenic shift in influenza viruses?
A) A) Worldwide distribution B) B) Segmented genome C) C) Attachment spikes D) D) Ease of transmission E) E) Different subtypes |
B) B) Segmented genome
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