Microbio 4
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Questions and Answers

What is the primary criterion used in the classical system to classify viruses?

  • Nature of the cytoplasmic effects
  • Size of the nucleic acid
  • Symmetry of the protein shell (correct)
  • Presence of a lipid membrane
  • Which type of virus is characterized by a capsomere structure and a length of 18 x 250 nm?

  • Tobacco Mosaic Virus (correct)
  • Murine leukemia virus
  • Polio virus
  • Common cold adenovirus
  • In virology, what is a common method for determining virus titer?

  • Plaque formation assay (correct)
  • DNA sequencing
  • Western blotting
  • Electron microscopy imaging
  • What is a characteristic feature of RNA viral shapes known as helical viruses?

    <p>Capsomeres arranged in a spiral along the nucleic acid</p> Signup and view all the answers

    Which type of virus is known for forming syncytium, a fused cell with multiple nuclei?

    <p>Murine leukemia virus</p> Signup and view all the answers

    What is a virus composed of?

    <p>Protein surrounded by a coat of nucleic acid</p> Signup and view all the answers

    Which scientist discovered the Tobacco Mosaic Virus in 1935 by crystallizing the virus?

    <p>Wendell Stanley</p> Signup and view all the answers

    What term refers to the protein coat surrounding the viral nucleic acid?

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

    Which step comes first in the lytic cycle of phage T4?

    <p>Entry of phage DNA and degradation of host DNA</p> Signup and view all the answers

    What triggers the excision of viral DNA from the chromosome in the lysogenic cycle of bacteriophage lambda?

    <p>UV light</p> Signup and view all the answers

    What is the function of viral envelopes?

    <p>Help the virus attach to host cells</p> Signup and view all the answers

    Which virus is closest in size to a smallpox virus?

    <p>Bacteriophage T4</p> Signup and view all the answers

    What is the role of viral glycoproteins in viruses' host range?

    <p>Affect the number of species the virus can infect</p> Signup and view all the answers

    In attachment of animal viruses, which method involves viral glycoproteins staying in the cytoplasmic membrane of the host?

    <p>Membrane fusion</p> Signup and view all the answers

    What is the primary function of tail sheath and tail fiber in bacteriophages?

    <p>Help the bacteriophage attach to bacterial cells</p> Signup and view all the answers

    What is the process by which the cytoplasmic membrane of the host engulfs a virus?

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

    Which of the following is NOT part of the viral genome classification?

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

    In the Baltimore classification, which category does single-stranded DNA viruses fall into?

    <p>Single-stranded RNA (+) strand</p> Signup and view all the answers

    Which type of viral genome has both + strand and - strand RNA?

    <p>(+) Strand RNA with DNA intermediate</p> Signup and view all the answers

    What is the central dogma used for in the classification of viruses?

    <p>Classifying viruses based on their genome type</p> Signup and view all the answers

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