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 (D)</p> Signup and view all the answers

What type of growth favors Streptococcus spp.?

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

What is the microbiological arrangement of Streptococcus spp.?

<p>Chains (B)</p> Signup and view all the answers

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

<p>Streptococcus mutans (D)</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 (C)</p> Signup and view all the answers

Which Streptococcus species is known for its capsule formation?

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

Which Streptococcus group is generally involved in subacute endocarditis?

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

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

<p>Streptococcus pneumoniae (B)</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 (A)</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 (A)</p> Signup and view all the answers

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

<p>Capsule (C)</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. (B)</p> Signup and view all the answers

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

<p>Pneumonia (C)</p> Signup and view all the answers

What type of hemolysis is associated with Streptococcus pyogenes?

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

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

<p>White colonies (C)</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 (D)</p> Signup and view all the answers

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

<p>Pharyngitis (B)</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 (A)</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 (C)</p> Signup and view all the answers

What type of pathogen is Streptococcus pneumoniae?

<p>Bacterium (A)</p> Signup and view all the answers

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

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

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