Viral Genome Entry and Replication Mechanisms
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Questions and Answers

What is the name of the viral DNA when it integrates into the host bacterial chromosome?

  • Retroviral DNA
  • Prophage (correct)
  • Virulent DNA
  • Rhabdoviral DNA
  • Which type of phages can remain dormant in the host cell until triggered by an environmental signal to switch to the lytic mode?

  • Retroviruses
  • Virulent phages
  • Temperate phages (correct)
  • Oncogenic phages
  • What enables viruses to propagate without killing the host cells during the lysogenic cycle?

  • Generation of active phages
  • Ability to regenerate infected tissue
  • Release of hydrolytic enzymes
  • Integration of prophage into bacterial chromosome (correct)
  • Which enzyme transcribes an RNA template into a DNA copy in retroviruses?

    <p>Reverse transcriptase</p> Signup and view all the answers

    What triggers the transition from the lysogenic cycle to the lytic cycle in temperate phages?

    <p>Environmental signal</p> Signup and view all the answers

    Which type of viruses have the most complicated replicative cycles, involving reverse transcriptase?

    <p>'Retroviruses'</p> Signup and view all the answers

    How do bacteriophage viruses inject DNA into a bacterium?

    <p>Through their elaborate tail apparatus</p> Signup and view all the answers

    What is the outcome of the lytic cycle in bacteriophages?

    <p>Death of the host cell</p> Signup and view all the answers

    How do phages replicate within a bacterium in the lysogenic cycle?

    <p>By integrating their DNA into the bacterial chromosome</p> Signup and view all the answers

    What do we call phages that can use both lytic and lysogenic cycles for replication?

    <p>Temperate phages</p> Signup and view all the answers

    Which type of phage replicates only through the lytic cycle?

    <p>Virulent phages</p> Signup and view all the answers

    What is the outcome of integration of phage DNA into the bacterial chromosome?

    <p>Formation of prophages</p> Signup and view all the answers

    Which of the following is true regarding viruses?

    <p>Viruses cannot reproduce outside the host</p> Signup and view all the answers

    Which component of the viral envelope membrane is of viral origin?

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

    What structure does the arrow point to in a virus?

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

    What is a characteristic of virulent phages?

    <p>They destroy the host cell upon release</p> Signup and view all the answers

    What term describes a phage that integrates its DNA into the host genome?

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

    Which process involves a virus remaining dormant within a host cell for an extended period?

    <p>Lysogenic cycle</p> Signup and view all the answers

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