Microbiology: Chapter 16 The Viruses
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Questions and Answers

What is the general structural property of the simian virus 40 (SV-40) capsid?

  • It contains both pentameric and hexameric capsomers
  • It contains only hexameric capsomers
  • It does not contain any capsomers
  • It contains only pentameric capsomers (correct)

    • Which type of virus is SV-40?

  • Single-stranded DNA virus
  • Double-stranded DNA virus (correct)
  • Single-stranded RNA virus
  • Double-stranded RNA virus

    • What disease can SV-40 cause in rhesus monkeys?

  • Musculoskeletal disease
  • Gastrointestinal disease
  • Respiratory disease
  • Central nervous system disease (correct)

    • Where was SV-40 first discovered?

    <p>In cultures of monkey kidney cells during poliovirus vaccine preparation</p> Signup and view all the answers

    How many capsomers does the SV-40 capsid contain?

    <p>72</p> Signup and view all the answers

    In which animal can SV-40 produce tumors?

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

    Which of the following statements about viruses is NOT true?

    <p>Viruses can reproduce both within and outside living cells.</p> Signup and view all the answers

    How are viruses cultured for study?

    <p>By inoculating living hosts or cell cultures with a virion preparation.</p> Signup and view all the answers

    What is the main component of a nucleocapsid in viruses?

    <p>Nucleic acid surrounded by a protein capsid</p> Signup and view all the answers

    How are viruses classified?

    <p>Based on their nucleic acid’s characteristics, capsid symmetry, and the presence or absence of an envelope.</p> Signup and view all the answers

    Which statement about the genomes of viruses is true?

    <p>Virus genomes can be either single-stranded or double-stranded DNA or RNA, with different shapes.</p> Signup and view all the answers

    What is the role of protomers in virus capsids?

    <p>They self-assemble through noncovalent bonds to form the virus capsid.</p> Signup and view all the answers

    What contributes to the purification of viruses during culture?

    <p>Large size relative to cell components and high protein content</p> Signup and view all the answers

    What are obligately intracellular parasites?

    <p><strong>Viruses</strong> that can only reproduce within living cells</p> Signup and view all the answers

    Why are viruses studied by virologists?

    <p><strong>As they contribute significantly</strong> to the discipline of molecular biology</p> Signup and view all the answers

    Which field is based on discoveries in virology?

    <p><strong>Genetic engineering</strong></p> Signup and view all the answers

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