25 Questions
Which of the following is a characteristic of Streptococcus spp.?
Capnophilic growth
What is the significance of lactic acid production by some Streptococcus spp.?
Causes caries
What is the classification based on complete hemolysis in blood agar for streptococci?
Beta-hemolytic
What distinguishes streptococci from staphylococci?
Catalase production
What type of growth favors Streptococcus spp.?
High CO2 concentration
What is the microbiological arrangement of Streptococcus spp.?
Chains
Which Streptococcus species is associated with dental plaque formation and caries production?
Streptococcus mutans
Which group does Streptococcus pneumoniae belong to based on its hemolytic characteristics?
It is not classified based on hemolytic characteristics
Which Streptococcus species is known for its capsule formation?
Streptococcus pneumoniae
Which Streptococcus group is generally involved in subacute endocarditis?
Viridans streptococci
Which Streptococcus species is non-capsulated and has poor cariogenic capacity?
Streptococcus pneumoniae
Which Streptococcus species is sensitive to optochin and soluble in the presence of bile salts?
Streptococcus pneumoniae
Which Streptococcus group includes species with a great mucous layer and glucans involved in plaque formation?
Streptococcus mutans group
Which of the following is a virulence factor of Streptococcus pyogenes?
Capsule
What is the main difference between Streptococcus pneumoniae and Streptococcus viridans in terms of bile solubility and optochin sensitivity?
Streptococcus pneumoniae is bile soluble and optochin sensitive, while Streptococcus viridans is not.
Which of the following diseases is NOT caused by Streptococcus pyogenes?
Pneumonia
What type of hemolysis is associated with Streptococcus pyogenes?
β-hemolysis
Which virulence factor of Streptococcus pyogenes is responsible for inhibiting phagocytosis in non-immune humans?
M protein
What is the characteristic feature of the colonies of Streptococcus pyogenes on blood agar?
White colonies
Which enzyme produced by Streptococcus pyogenes facilitates the spreading of the bacteria by dissolving the fibrin clot?
Streptokinase
What type of infection does Streptococcus pyogenes cause that results in scarlet fever?
Pharyngitis
What autoimmune disease can be caused by Streptococcus pyogenes after pharyngitis or skin infection?
Acute rheumatic fever
What is the treatment of choice for mild infections caused by Streptococcus pyogenes?
Oral penicillin or amoxicillin
What type of pathogen is Streptococcus pneumoniae?
Bacterium
What is the main cause of bacterial otitis and sinusitis according to the text?
Streptococcus pneumoniae
Test your knowledge on the microbiological characteristics and identification of Streptococcus genus, including their gram-positive cocci structure, anaerobic nature, and growth preferences.
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