Quiz Over ChapterĀ 15 Microbiology

16 Questions | Total Attempts: 361

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Quiz Over Chapter 15 Microbiology

Microbiology is the branch of the scientific study of biology which deals predominantly with microscopic organisms such as bacteria, viruses, archaea, fungi and protozoa – essentially, organisms that are too small to be studied by the naked eye. How much do you know about microbiology?


Questions and Answers
  • 1. 
    The degree or extent to which a microbe is pathogenic?
    • A. 

      Virulence

    • B. 

      Illness

    • C. 

      Pathogenicity

  • 2. 
    Capsules(glycocalyx covering around cell wall that protects cell from phagocytosis; host antibodies can enable phagocytosis) are one way for microbes to evade a hosts defenses?
    • A. 

      True

    • B. 

      False

  • 3. 
    Portals of entry by which a microbe may get into the host cell
    • A. 

      Mucous membranes that like the GI respiratory, & urogenital tracts & conjunctiva

    • B. 

      Skin- typically must be broken in order for pathogens to gain access and cause disease; some pathogens such as hookworm can bore through

    • C. 

      Parenteral route- direct deposition of microbe beneath skin or into mucous membranes; punctures, injections, wounds, bites ect. allow microbes in.

  • 4. 
    Proteins in cell wall can enhance attachment and help cell resist phagocytosis(M protein of Streptococcus pyogenes); M tuberculosis has waxy lipid in cell and also is able to mutiply within phagocytosis.another way for a microbe to evade a host's defenses
  • 5. 
    Coagulases, kinases, hyaluronidase, collagenase, and IgA proteases are all?
    • A. 

      Enyzymes/exoenzymes that help a microbe evade a host's defenses

    • B. 

      Antigenic variation

    • C. 

      Capsules

  • 6. 
    The ability to change (vary) surface antigens refers to antigenic variation?ex: influenza virus
    • A. 

      True

    • B. 

      False

  • 7. 
    Some bacteria such as Salmonella produce invasins which cause actin in host cell to form indention on plasma membrane (membrane ruffing) & bacterium is engulfed into cell; others use host actin to carry them through the cell and from cell to cell. This is a description of what method of evading a host's defenses?
  • 8. 
    Exotoxins are secreted into surroundings or released when cell is lysed
    • A. 

      True

    • B. 

      False

  • 9. 
    What are a lipid portion (lipid A) of lipopolysaccharides found in outer membrane of Gram (-) bacteria? They are released when bacteria die. They are heat resistant and cannot be converted to toxoids for vaccination.
    • A. 

      A-B toxins

    • B. 

      Superantigens

    • C. 

      Endotoxins

  • 10. 
    The release of endotoxins causes what symptom(s) for all species?
    • A. 

      Fever

    • B. 

      Chills

    • C. 

      Weakness

    • D. 

      Aches

    • E. 

      Even shock and death

    • F. 

      Swelling

  • 11. 
    These activate blood clotting proteins, causing small clots that decrease blood flow.
  • 12. 
    The process in which bacterium gains new abilities due to phage genes refers to lysogenic conversion.
    • A. 

      True

    • B. 

      False

  • 13. 
    An example of lysogenic conversion would be when genes for dipthereia toxin and botulinum neurotoxin and for ability of streptococcus pneumonia to produce capsule are on lysogenic phages.
    • A. 

      True

    • B. 

      False

  • 14. 
    Viruses often evade host defenses by?
    • A. 

      Typically growing inside cells

    • B. 

      Able to gain access through attachment sites that match host receptors

    • C. 

      Both A and B

  • 15. 
    Cytophathic effects are NOT visible signs of viral infection
    • A. 

      True

    • B. 

      False

  • 16. 
    Cytocidal effects cause death. examples include stopping mitosis, lysis of a host cell, formation of inclusion bodies, formation of syncytium, antigenic changes, production of intereferon, chromosomal changes and transformation of cell
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