Microbiology - Chapter 7

20 Questions  I  By Dindiam
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Microbiology Quizzes & Trivia

  
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  • 1. 
    Most bacteria reproduce by
    • A. 

      Sexual reproduction

    • B. 

      Binary fission

    • C. 

      Budding

    • D. 

      Homologous recombination


  • 2. 
    Microbial growth
    • A. 

      Refers to the increase in the size of a microbial cell

    • B. 

      Refers to the increase in the frequency of cell division

    • C. 

      In a single generation's time leads to double the cell size

    • D. 

      In a single generation's time leads to double the number of microbes


  • 3. 
    Serial dilutions are used to
    • A. 

      Slow down the growth of microbes

    • B. 

      Speed up the growth of microbes

    • C. 

      Obtain bacterial cultures at several different concentrations

    • D. 

      Form bacterial colonies


  • 4. 
    Turbidity in a bacterial culture can be measured using a/n
    • A. 

      Incubator

    • B. 

      Colony county

    • C. 

      Spectrophotometer

    • D. 

      Chemostat


  • 5. 
    Acidophiles would be expected to grow best at a pH of
    • A. 

      3

    • B. 

      6

    • C. 

      9

    • D. 

      12


  • 6. 
    Most human pathogens are
    • A. 

      Psychrophiles

    • B. 

      Mesophiles

    • C. 

      Thermophiles

    • D. 

      Acidophiles


  • 7. 
    Which of the following types of organisms would be most likely to have evolved to live in the large intestine, where there is a complete lack of free oxygen?
    • A. 

      Obligate aerobe

    • B. 

      Obligate anaerobe

    • C. 

      Facultative anaerobe

    • D. 

      Aerotolerant anaerobe


  • 8. 
    Which type of cell will generally shift to aerobic metabolism when oxygen is available but will carry on fermentation otherwise?
    • A. 

      Aerotolerant anaerobes

    • B. 

      Facultative anaerobes

    • C. 

      Obligate anaerobes

    • D. 

      Obligate aerobes


  • 9. 
    When cells are placed in a hypertonic environment they will undergo
    • A. 

      Lysis

    • B. 

      No change in size

    • C. 

      Swelling of the cell which is contained by the cell wall

    • D. 

      Plasmolysis


  • 10. 
    Sporulation occurs in gram positive bacilli, an example of it is
    • A. 

      Bacillus cereus

    • B. 

      Staphylococcus aureus

    • C. 

      Klebsiella pneumoniae

    • D. 

      Citrobacter sp.


  • 11. 
    Endospores are
    • A. 

      Metabolically active

    • B. 

      Reproductive structures

    • C. 

      Found mostly in Gram negative organisms

    • D. 

      Protective structures


  • 12. 
    Sporulation usually occurs in response to
    • A. 

      A decrease in the level of carbon or nitrogen

    • B. 

      An increase in temperature

    • C. 

      A decrease in the amount of water

    • D. 

      An increase in ultraviolet radiation


  • 13. 
    A candle jar would be used for growing
    • A. 

      Gram negative organisms

    • B. 

      Fastidious organisms

    • C. 

      Thermophiles

    • D. 

      Anaerobes


  • 14. 
    Sporulation is the production of spore and occurs in gram+ organisms.  Triggers are ph, temperature, concentration of enzyme
    • A. 

      True

    • B. 

      False


  • 15. 
    Bacterial growth in colonies on agar plates
    • A. 

      Have all phases of growth occurring simultaneously somewhere in the colony

    • B. 

      Most growth occurs at the center of the colony

    • C. 

      Involves budding of small new colonies from the surface of an existing colony

    • D. 

      Have lag phase cells in the center of the colony, surrounded by a ring of cells in exponential phase


  • 16. 
    An obligate psychrophile  would produce a turbin culture at ___________degrees Celcius
    • A. 

      10

    • B. 

      30

    • C. 

      45

    • D. 

      60


  • 17. 
    When a bacterial cell divides into two new cells, the new cells are called
    • A. 

      Daughter cells

    • B. 

      Sister cells

    • C. 

      Son cells

    • D. 

      Father cells


  • 18. 
    The toxic effects of the byproducts of oxygen metabolism are mitigated by which of the following?
    • A. 

      Catalase

    • B. 

      Superoxide dismutase

    • C. 

      Lactase

    • D. 

      Two of the above


  • 19. 
    Where would you expect to find a barophile
    • A. 

      At the bottom of a lake

    • B. 

      In unpasteurized milk

    • C. 

      In the large intestine

    • D. 

      In sewage


  • 20. 
    A culture that contains only a single species of organism is known as a
    • A. 

      Pure culture

    • B. 

      Koch culture

    • C. 

      Mixed culture

    • D. 

      Contaminated culture


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