Microbiology Unit 13: Streptococcus Genus

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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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