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 (C)</p> Signup and view all the answers

How many capsomers does the SV-40 capsid contain?

<p>72 (C)</p> Signup and view all the answers

In which animal can SV-40 produce tumors?

<p>Hamsters (A)</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. (B)</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. (D)</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 (C)</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. (B)</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. (D)</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. (B)</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 (A)</p> Signup and view all the answers

What are obligately intracellular parasites?

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

Which field is based on discoveries in virology?

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

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