Microbiology Trivia Quiz: All About Organisms

28 Questions

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Microbiology Quizzes & Trivia

The earth is not only made up of organisms that you can see, but it has some organisms that vary in size and makeup. Do you think that you can handle this quiz on organisms we have learned about in the past few weeks? Take up the quiz below and get to find out for sure as you prepare for the final exam. All the best!


Questions and Answers
  • 1. 
    Which statement(s) are true?
    • A. 

      The organism may be protected from the drug by its nuclear membrane

    • B. 

      Virulence is a quantitative measure of pathogenicity.

    • C. 

      Pathogenicity varies markedly for individual pathogens.

    • D. 

      All of the above

  • 2. 
    Which statement(s) are true?
    • A. 

      The most common and most stable microorganisms that inhabit the skin are gram-positive Bacteria.

    • B. 

      Propionibacterium acnes is a normal resident of the skin.

    • C. 

      Lipophilic yeasts are sometimes found on the scalp.

    • D. 

      All of the statements above are true.

  • 3. 
    Which statement(s) are true?
    • A. 

      Mucous membranes are composed of a single layer or multiple layers of epithelial cells.

    • B. 

      Microorganisms are almost always found on surfaces of the body.

    • C. 

      Microorganisms are not normally found in the blood.

    • D. 

      All of the statements above are true.

  • 4. 
    Which region of the gastrointestinal tract has both the largest population of bacteria and the greatest species diversity?
    • A. 

      Colon

    • B. 

      Duodenum

    • C. 

      Ileum

    • D. 

      Jejunum

  • 5. 
    Which exotoxin binds to the presynaptic membranes on the termini of the stimulatory motor neurons at the neuromuscular junction, blocking the release of acetylcholine
    • A. 

      Diphtheria toxin

    • B. 

      Tetanus toxin

    • C. 

      Botulinum toxin

    • D. 

      Cholera toxin

  • 6. 
    The toxin of Vibrio cholerae is classified as an 
    • A. 

      Exotoxin.

    • B. 

      Endotoxin

    • C. 

      Enterotoxin

    • D. 

      Exerotoxin

  • 7. 
    The substance in the lipopolysaccharide of gram-negative Bacteria that is responsible for the effects of the toxin is
    • A. 

      The core polysaccharide.

    • B. 

      Lipid A

    • C. 

      The O-polysaccharide

    • D. 

      The dideoxysugars

  • 8. 
    Leukocidins are lytic agents that 
    • A. 

      Lyse red blood cells

    • B. 

      Lyse white blood cells

    • C. 

      Lyse bacterial cells

    • D. 

      Destroy viruses

  • 9. 
    Endogenous pyrogens
    • A. 

      Affect the temperature-controlling center of the brain.

    • B. 

      Are always present when the LD50 exceeds 400 μg per individual.

    • C. 

      Have a lipopolysaccharide core.

    • D. 

      Cause vomiting in most individuals.

  • 10. 
    The Staphylococcus aureus toxin
    • A. 

      Stimulates large numbers of immune lymphocytes

    • B. 

      Causes systemic inflammatory responses

    • C. 

      Causes intestinal inflammatory responses.

    • D. 

      All of the above

  • 11. 
    What group of microorganisms is better adapted to live as normal flora on the skin?
    • A. 

      Gram-negative bacteria

    • B. 

      Gram-positive bacteria

    • C. 

      Yeasts

    • D. 

      Molds

  • 12. 
    What is the enzyme found in saliva that cleaves glycosidic linkages in the peptidoglycan of the bacterial cell wall?
    • A. 

      Lactoperoxidase

    • B. 

      Lactoferrin

    • C. 

      Hyaluronidase

    • D. 

      Lysozyme

  • 13. 
    What is the term that refers to people who are infected with a pathogen but do not normally develop disease?
    • A. 

      Healthy

    • B. 

      Infected

    • C. 

      Diseased

    • D. 

      Carriers

  • 14. 
    The most important factor in the colonization of a host by a pathogen is
    • A. 

      The temperature of the body site

    • B. 

      The availability of nutrients at the body site

    • C. 

      The presence or absence of oxygen at the body site

    • D. 

      The pH of the body site

  • 15. 
    Which is a major virulence factor that prevents phagocytosis by the host defense systems?
    • A. 

      Capsule

    • B. 

      Exotoxin

    • C. 

      Pili

    • D. 

      Streptokinase

  • 16. 
    Beneficial relationship
  • 17. 
    Benign relationship
  • 18. 
    Harmful relationship
  • 19. 
    LPS from gram-negative bacteria cause fever, diarrhea, lower number of WBC, inflammationall of these type cause similar symptoms
  • 20. 
    Potentattacks specific cells, causing specific impairment
  • 21. 
    Exotoxin that kills cells
  • 22. 
    Exotoxin that destroys nerve function
  • 23. 
    Exotoxins that impair intestinal permeability
  • 24. 
    Example of nonspecific defense
    • A. 

      Barriers - anatomical structure

    • B. 

      Chemical deterrants - lysozyme, digestive enzymes

    • C. 

      Phagocytic cells, inflammation, fever

    • D. 

      Antimicrobial chemicals - complement system, interferons

    • E. 

      All of the above

  • 25. 
    Mechanisms of pathogenesis
    • A. 

      Produce/release enzymes, ex: cell lysis, destroy cell membrane, clot blood

    • B. 

      Exotoxin, endotoxin

    • C. 

      Capsule/fimbriae/surface molecules

    • D. 

      Antigen to prevent phagocytosis

    • E. 

      All of the above

  • 26. 
    Goals of a pathogen
  • 27. 
    Causes disease, due to lack of host resistance, when an organism enters a new habitat, or when normal flora are altered
  • 28. 
    Found on skin, mucosal surfaces, mouth, respiratory tract, gastrointestinal tract