Microbiology Unit 13: Streptococcus Genus
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Questions and Answers

Which of the following is a characteristic of Streptococcus spp.?

  • Facultative aerobes
  • Arranged in clusters
  • Gram-negative cocci
  • Capnophilic growth (correct)

    • What is the significance of lactic acid production by some Streptococcus spp.?

  • Induces periodontal disease
  • Causes caries (correct)
  • Is used in antibiotic production
  • Promotes tooth enamel formation

    • What is the classification based on complete hemolysis in blood agar for streptococci?

  • Beta-hemolytic (correct)
  • Gamma-hemolytic
  • Alpha-hemolytic
  • Delta-hemolytic

    • What distinguishes streptococci from staphylococci?

    <p>Catalase production</p> Signup and view all the answers

    What type of growth favors Streptococcus spp.?

    <p>High CO2 concentration</p> Signup and view all the answers

    What is the microbiological arrangement of Streptococcus spp.?

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

    Which Streptococcus species is associated with dental plaque formation and caries production?

    <p>Streptococcus mutans</p> Signup and view all the answers

    Which group does Streptococcus pneumoniae belong to based on its hemolytic characteristics?

    <p>It is not classified based on hemolytic characteristics</p> Signup and view all the answers

    Which Streptococcus species is known for its capsule formation?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

    Which Streptococcus group is generally involved in subacute endocarditis?

    <p>Viridans streptococci</p> Signup and view all the answers

    Which Streptococcus species is non-capsulated and has poor cariogenic capacity?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

    Which Streptococcus species is sensitive to optochin and soluble in the presence of bile salts?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

    Which Streptococcus group includes species with a great mucous layer and glucans involved in plaque formation?

    <p>Streptococcus mutans group</p> Signup and view all the answers

    Which of the following is a virulence factor of Streptococcus pyogenes?

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

    What is the main difference between Streptococcus pneumoniae and Streptococcus viridans in terms of bile solubility and optochin sensitivity?

    <p>Streptococcus pneumoniae is bile soluble and optochin sensitive, while Streptococcus viridans is not.</p> Signup and view all the answers

    Which of the following diseases is NOT caused by Streptococcus pyogenes?

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

    What type of hemolysis is associated with Streptococcus pyogenes?

    <p>β-hemolysis</p> Signup and view all the answers

    Which virulence factor of Streptococcus pyogenes is responsible for inhibiting phagocytosis in non-immune humans?

    <p>M protein</p> Signup and view all the answers

    What is the characteristic feature of the colonies of Streptococcus pyogenes on blood agar?

    <p>White colonies</p> Signup and view all the answers

    Which enzyme produced by Streptococcus pyogenes facilitates the spreading of the bacteria by dissolving the fibrin clot?

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

    What type of infection does Streptococcus pyogenes cause that results in scarlet fever?

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

    What autoimmune disease can be caused by Streptococcus pyogenes after pharyngitis or skin infection?

    <p>Acute rheumatic fever</p> Signup and view all the answers

    What is the treatment of choice for mild infections caused by Streptococcus pyogenes?

    <p>Oral penicillin or amoxicillin</p> Signup and view all the answers

    What type of pathogen is Streptococcus pneumoniae?

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

    What is the main cause of bacterial otitis and sinusitis according to the text?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

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