MEDBIO 5: General Properties of Viruses Microbiology
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Questions and Answers

What is the term for the smallest infectious agent that contains only one kind of nucleic acid?

  • Bacteriophage
  • Viroid
  • Prion
  • Virus (correct)
  • What is the purpose of the coat proteins in a virus?

  • To facilitate the replication of the viral genome
  • To assemble to form the capsid and encase the viral nucleic acid (correct)
  • To recognize and bind to specific host cells
  • To transcribe the viral genome into messenger RNA
  • What is the term for the entire infectious unit of a virus?

  • Nucleocapsid
  • Virion (correct)
  • Viral genome
  • Capsid
  • What is the size of the RNA genome in Astroviridae?

    <p>6.8–7.0 kb</p> Signup and view all the answers

    What is the function of the lipid-containing membrane in a virus?

    <p>To facilitate the attachment and penetration of the virus into the host cell</p> Signup and view all the answers

    What is the term for the protein-nucleic acid complex that represents the packaged form of the viral genome?

    <p>Nucleocapsid</p> Signup and view all the answers

    Which family of viruses has a linear, double-stranded, segmented RNA genome?

    <p>Reoviridae</p> Signup and view all the answers

    What is the characteristic surface feature of Astroviridae particles?

    <p>Star-shaped outline</p> Signup and view all the answers

    What is the size range of viruses in diameter?

    <p>20-300 nm</p> Signup and view all the answers

    Which virus family lacks a genome linked protein (VPg)?

    <p>Hepeviridae</p> Signup and view all the answers

    What is a characteristic of diploid cell lines?

    <p>They retain their normal chromosome pattern</p> Signup and view all the answers

    What is the size of the particles in Picobirnaviridae?

    <p>35–40 nm</p> Signup and view all the answers

    Which virus family is associated with gastroenteritis in humans and Colorado tick fever in animals?

    <p>Reoviridae</p> Signup and view all the answers

    Which of the following is not a cytopathic effect of virus infection?

    <p>Hemagglutination</p> Signup and view all the answers

    What is the purpose of hemadsorption?

    <p>To detect virus-encoded proteins</p> Signup and view all the answers

    What type of virus causes focal areas of swollen, rounded cells in monolayers of cultured cells?

    <p>Herpesvirus</p> Signup and view all the answers

    Which of the following is a method of detecting virus-specific nucleic acid?

    <p>Polymerase chain reaction</p> Signup and view all the answers

    What type of cell line is derived from diploid or malignant tissues and can grow indefinitely?

    <p>Continuous cell line</p> Signup and view all the answers

    What is the primary function of receptor molecules on the cell's surface?

    <p>To determine cell tropism and viral pathogenesis</p> Signup and view all the answers

    What occurs shortly after penetration in the viral replication cycle?

    <p>Uncoating</p> Signup and view all the answers

    What is unique about negative-strand viruses?

    <p>They lack enzymes for mRNA synthesis</p> Signup and view all the answers

    What is the result of the morphogenesis step in the viral replication cycle?

    <p>Progeny virus formation</p> Signup and view all the answers

    What is the purpose of the attachment step in the viral replication cycle?

    <p>To bind to specific receptor sites</p> Signup and view all the answers

    What is a characteristic of the synthesis of viral components?

    <p>It occurs in a highly organized sequence</p> Signup and view all the answers

    What is a major concern regarding the use of animal organs as xenografts in humans?

    <p>The potential introduction of new viral pathogens</p> Signup and view all the answers

    What is a characteristic of bioterrorism agents?

    <p>They can be genetically modified to increase virulence</p> Signup and view all the answers

    Which of the following is NOT an example of a viral agent that could be used for bioterrorism?

    <p>Hepatitis</p> Signup and view all the answers

    What is a public health measure that can contribute to the emergence of new viral strains?

    <p>Curtailment of prevention programs</p> Signup and view all the answers

    Which of the following is an example of a bacterial agent that could be used for bioterrorism?

    <p>Anthrax</p> Signup and view all the answers

    What is a risk category of bioterrorism agents?

    <p>Viral agents like smallpox and hemorrhagic fevers</p> Signup and view all the answers

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