Viral Morphology and Taxonomy
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Questions and Answers

What is the key event that happens during the Penetration stage of the Bacteriophage Lytic Cycle?

  • Viral components are assembled into virions
  • Bacterial virus attaches to the cell wall receptors
  • Viral sheath contracts to push viral DNA into the host cell (correct)
  • Viral DNA is incorporated into the bacterial host DNA
  • What is the stage in the Bacteriophage Lytic Cycle where the bacterial host cell is forced to make viral components?

  • Attachment
  • Biosynthesis (correct)
  • Penetration
  • Maturation
  • Which stage of the Bacteriophage Lytic Cycle involves the assembly of newly-made, mature viruses?

  • Penetration
  • Attachment
  • Biosynthesis
  • Maturation (correct)
  • What is the main purpose of viral lysozyme during the Attachment stage of the Bacteriophage Lytic Cycle?

    <p>Making a hole in the bacterial cell wall</p> Signup and view all the answers

    What is a Virion in the context of the Bacteriophage Lytic Cycle?

    <p>Newly-formed, mature virus capable of infecting other cells</p> Signup and view all the answers

    During which stage of the Bacteriophage Lytic Cycle is viral DNA present inside the bacterial host cell?

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

    What happens to the bacterial host cell during the lytic cycle of a bacteriophage?

    <p>The host cell lyses or ruptures, resulting in its death.</p> Signup and view all the answers

    What happens during the lysogenic cycle of a bacteriophage?

    <p>The phage DNA integrates into the host cell's DNA and remains dormant.</p> Signup and view all the answers

    What is a consequence of lysogeny in bacterial host cells?

    <p>Phage conversion, where non-pathogenic bacteria become pathogenic.</p> Signup and view all the answers

    Which of the following is NOT a stage in the multiplication (lytic cycle) of animal viruses?

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

    What is the process called when a virus induces the expression of cancer-causing genes in a host cell?

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

    What is the purpose of growing viruses in the laboratory?

    <p>All of the above</p> Signup and view all the answers

    What is the difference between viral species and viral subspecies/strains?

    <p>Viral species share the same genetic information, while subspecies/strains differ in their genetic information</p> Signup and view all the answers

    How are bacteriophages quantified during their growth in bacterial cultures?

    <p>By counting the number of plaques formed</p> Signup and view all the answers

    What is the primary method used for identifying viruses in the laboratory?

    <p>Serological tests</p> Signup and view all the answers

    What is the difference between the lytic cycle and the lysogenic cycle in bacteriophages?

    <p>The lytic cycle leads to the death of the host bacterial cell, while the lysogenic cycle does not</p> Signup and view all the answers

    Can animal viruses grow in bacterial cells?

    <p>No, animal viruses can only grow in animal cells or tissue cultures</p> Signup and view all the answers

    How do enveloped animal viruses enter the host cell?

    <p>By fusion with the host cell membrane</p> Signup and view all the answers

    What is the process by which the viral capsid is disintegrated to expose the viral genetic material?

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

    Which of the following is a characteristic of non-enveloped animal viruses?

    <p>They are released by rupture</p> Signup and view all the answers

    How can the RNA of an animal virus incorporate into the host cell's DNA?

    <p>Through the action of the enzyme reverse transcriptase</p> Signup and view all the answers

    Which virus family causes warts and cervical/anal cancers?

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

    What is the term used for viruses that can cause cancer?

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

    What is the process by which enveloped animal viruses are released from the host cell?

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

    How can oncoviruses transform normal cells into cancerous cells?

    <p>By integrating their DNA into the host cell's DNA and inducing tumors</p> Signup and view all the answers

    How do non-enveloped animal viruses enter the host cell?

    <p>Through receptor-mediated endocytosis</p> Signup and view all the answers

    What is the process by which non-enveloped animal viruses are released from the host cell?

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

    What type of viral infection is characterized by a rapid onset of symptoms and short duration?

    <p>Acute viral infection</p> Signup and view all the answers

    Which of the following is an example of a transmissible neurological disease caused by prions?

    <p>Creutzfeldt-Jakob Disease (CJD)</p> Signup and view all the answers

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