Microbiology: Staphylococcus and Selective Media Quiz
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Questions and Answers

What is the purpose of Mannitol Salt Agar (MSA)?

  • To select for members of the genus Staphylococcus (correct)
  • To prevent the growth of any bacteria
  • To encourage the growth of all bacteria equally
  • To solely inhibit the growth of Staphylococcus aureus
  • Why is Staphylococcus considered facultatively anaerobic?

  • Because it cannot survive in the presence of oxygen
  • Because it can survive in both the presence and absence of oxygen (correct)
  • Because it prefers anaerobic conditions
  • Because it can only survive in the presence of oxygen
  • What causes the phenol red in Mannitol Salt Agar to turn yellow?

  • The high salt concentration
  • The fermentation of mannitol producing an acidic byproduct (correct)
  • The addition of Staphylococcus aureus
  • The presence of gram-negative bacteria
  • What type of hemolysis is typical for Staphylococcus?

    <p>Beta hemolysis</p> Signup and view all the answers

    Which type of bacteria does Mannitol Salt Agar primarily select for?

    <p>Staphylococcus species</p> Signup and view all the answers

    Which type of streptococci breaks down red blood cells and hemoglobin completely?

    <p>Beta-hemolytic</p> Signup and view all the answers

    What causes the greenish color in alpha hemolysis on blood agar?

    <p>Biliverdin</p> Signup and view all the answers

    Which characteristic helps classify streptococci into three groups based on hemolysis on blood agar?

    <p>Colony morphology</p> Signup and view all the answers

    What is the distinguishing feature of gamma-hemolytic streptococci on blood agar?

    <p>No hemolysis</p> Signup and view all the answers

    Which type of streptococci perform better in an anaerobic environment due to their hemolysins?

    <p>Obligate anaerobes</p> Signup and view all the answers

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