Chapter 25 Microbiology

63 Questions | Total Attempts: 288

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Microbiology Quizzes & Trivia

Questions and Answers
  • 1. 
    Virus morphology does not include which of the following characteristics?  
    • A. 

      Size

    • B. 

      Shape

    • C. 

      presence or absence of an envelope

    • D. 

      Host range

  • 2. 
    Which of the following uses dsRNA as the genome?  
    • A. 

      Parvovirus

    • B. 

      Bunyavirus

    • C. 

      Reovirus

    • D. 

      Poxvirus

  • 3. 
    Which of the following is(are) used in the classification of animal viruses?  
    • A. 

      Virion morphology

    • B. 

      genome structure

    • C. 

      Genetic relatedness

    • D. 

      All of the choices

  • 4. 
    The tails of some bacteriophage  
    • A. 

      include a contractile sheath.

    • B. 

      rotate like flagella to drive the phage genome into the cytoplasm of the host.

    • C. 

      Exhibit oar like motion that drives the phage genome into the cytoplasm of the host.

    • D. 

      None of the choices

  • 5. 
    Late mRNA products in T4 phage include  
    • A. 

      Phage structural proteins.

    • B. 

      Proteins that help with phage assembly without becoming part of the virion.

    • C. 

      Proteins involved in cell lysis and phage release.

    • D. 

      All of the above

  • 6. 
    Viruses infecting algae have never been detected.  
    • A. 

      True

    • B. 

      False

  • 7. 
    Which of the following represent(s) the way(s) in which enveloped viruses acquire their envelopes?  
    • A. 

      Budding through the plasma membrane.


    • B. 

       budding through internal cellular membranes.


    • C. 

      Viral enzymes are responsible for production of the envelope.


    • D. 

      For some viruses, a is correct; for other viruses, b is correct.

  • 8. 
    Unlike most enveloped viruses, herpes viruses involve the host __________ membrane in the formation of their envelope.  
    • A. 

      Plasma

    • B. 

      Nuclear

    • C. 

      Mitochondrial

    • D. 

      None of these

  • 9. 
    The most common type of molecule found on the surface of animal viruses for interacting with host cell receptors is a(n)  
    • A. 

      Lipoprotein

    • B. 

      Glycoprotein

    • C. 

      Phosphoprotein

    • D. 

      Teichoic acid

  • 10. 
    Which of the following does not use RNA as the genome?  
    • A. 

      Poxvirus

    • B. 

      Poliovirus

    • C. 

      Influenza virus

    • D. 

      Rabies virus

  • 11. 
    The largest viruses known are the  
    • A. 

      Herpes viruses

    • B. 

      Hepadnaviruses

    • C. 

      Adenoviruses

    • D. 

      Mimiviruses

  • 12. 
     A __________ infection is one in which the virus quits reproducing and remains dormant for a period before becoming active again.  
    • A. 

      Persistent

    • B. 

      Latent

    • C. 

      Slow virus

    • D. 

      None of these

  • 13. 
    In which of the following stages of the viral infectious cycle do enveloped viruses usually acquire their envelopes?  
    • A. 

      Penetration

    • B. 

      Component biosynthesis

    • C. 

      Assembly

    • D. 

      Release

  • 14. 
     For which of the following DNA viruses do(es) DNA replication occur in the cytoplasm rather than in the nucleus?  
    • A. 

      Poxviruses

    • B. 

      Herpes viruses

    • C. 

      Adenoviruses

    • D. 

      DNA replication occurs in the nucleus for all of these.

  • 15. 
     A bacterium carrying a dormant phage inserted in the chromosome is called a __________.  
  • 16. 
    Bacteriophage T4 blocks transcription of host genes using an enzyme that transfers an ______ from NAD onto the alpha subunit of RNA polymerase.  
  • 17. 
    __________ is an unusual base found in the DNA of T-even phages.  
  • 18. 
    ________ mRNA is synthesized before replication of the viral nucleic acid.  
  • 19. 
     For most T-even phages, the nucleic acid enters the host cell but the capsid is left outside.  
    • A. 

      True

    • B. 

      False

  • 20. 
    Glucosylation of hydroxymethylcytosine residues protects phage T4 DNA from cleavage by bacterial restriction enzymes.  
    • A. 

      True

    • B. 

      False

  • 21. 
    Once a virus establishes lysogeny, it may not switch to the lytic cycle at some later time.  
    • A. 

      True

    • B. 

      False

  • 22. 
    In the case of phage lambda, termination of lysogeny and entry into the lytic cycle usually occurs in response to environmental damage to the host DNA.  
    • A. 

      True

    • B. 

      False

  • 23. 
     In viral infections involving double-stranded DNA viruses, all of the viral genes are usually expressed prior to the replication of viral nucleic acid.  
    • A. 

      True

    • B. 

      False

  • 24. 
     Lysogeny always requires integration of the viral genome into the host chromosome.  
    • A. 

      True

    • B. 

      False

  • 25. 
    Phage T4 gains release from the infected host cell like many other double stranded DNA phages by interfering with the activity of enzymes that synthesize peptidoglycan.  
    • A. 

      True

    • B. 

      False