Streptococcaceae Family Quiz
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Questions and Answers

What is the classification scheme used for Streptococci based on serologic properties?

  • Biochemical properties
  • Hemolytic patterns: β, α & γ hemolysis
  • Classification is complicated
  • Lancefield groupings according to serologic properties (correct)

    • What is the characteristic appearance of α-hemolytic streptococci on blood agar?

  • Form a red zone around their colonies
  • Form a green zone around their colonies (correct)
  • Form a yellow zone around their colonies
  • Form a clear zone around their colonies

    • What kind of streptococci form a clear zone around their colonies on blood agar?

  • Pyogenic streptococci (correct)
  • Nonhemolytic streptococci
  • γ-hemolytic streptococci
  • α-hemolytic streptococci

    • What defines the pyogenic streptococci?

    <p>Presence of Lancefield antigens</p> Signup and view all the answers

    What is the preferred medium for the isolation of Fastidious Streptococcus species?

    <p>Blood-enriched medium</p> Signup and view all the answers

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