Neisseria Species and Their Natural Habitats Quiz
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Questions and Answers

What is the significance of pili in Neisseria gonorrhoeae?

  • Inhibit phagocytosis by neutrophils (correct)
  • Prevent the organism from adhering to host tissues
  • Promote the action of IgG antibodies
  • Directly cause inflammation in body tissues

    • What is the primary function of LOS (lipooligosaccharide) in Neisseria meningitidis?

  • Mediate damage to body tissues (correct)
  • Block inflammatory responses
  • Prevent antigenic variation
  • Serve as a protective device for the organism

    • Why are types T3 through T5 of N.gonorrhoeae considered avirulent?

  • They lack pili (correct)
  • They possess high adherence to host cells
  • They inhibit phagocytosis by neutrophils
  • They directly damage host tissues

    • What is the role of IgA protease in Neisseria species?

    <p>Cleave IgA on mucosal surfaces</p> Signup and view all the answers

    Which protein in Neisseria species is protective against the host's inflammatory response and serum complement-mediated killing?

    <p>Protein I (Por)</p> Signup and view all the answers

    Which Neisseria species is always pathogenic and not considered part of the normal biota?

    <p>Neisseria gonorrhoeae</p> Signup and view all the answers

    What is the primary reason that Neisseria gonorrhoeae and Neisseria meningitidis are considered strict human pathogens?

    <p>They have receptors for human transferrin</p> Signup and view all the answers

    Which Neisseria species, although primarily a commensal in dogs, has been isolated from dog bites in humans?

    <p>Neisseria weaveri</p> Signup and view all the answers

    What is a characteristic shared by pathogenic Neisseria species that contributes to their virulence?

    <p>Production of a capsule</p> Signup and view all the answers

    Which type of habitat do pathogenic Neisseria species typically inhabit in the human body?

    <p>Respiratory and urogenital tracts</p> Signup and view all the answers

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