18 Questions
Which characteristic helps differentiate Group D streptococci from other genera?
Catalase positivity
What is a distinguishing feature of Group B streptococci (S. agalactiae) in biochemical tests?
Capsule formation
How can Streptococcus pyogenes (Group A) be differentiated from other genera?
Beta-hemolysis on blood agar
What distinguishes Streptococcus from other genera in terms of catalase reaction?
Catalase negativity
Which of the following is a characteristic feature of S. pneumoniae (pneumococci) for biochemical identification?
Alpha-hemolysis on blood agar
Which characteristic helps differentiate Streptococcus from Neisseria when considering Gram staining characteristics?
Gram-negative staining
Which of the following statements is true regarding the differentiation of Staphylococcus species based on the coagulase test?
S.intermedius is a common isolate for coagulase positive Staphylococcus infections in humans.
In the biochemical identification of Stomatococcus versus other families, which enzyme is used as a differentiating factor?
Catalase
What is the characteristic result of the coagulase test for Staphylococcus aureus?
- (positive)
Which species among Staphylococci is sensitive to Bacitracin?
S.epidermidis
Which Staphylococcus species is resistant to Novobiocin?
S.saprophyticus
What is the key enzyme that is used to differentiate S.aureus from S.epidermidis and S.saprophyticus?
Coagulase
Which group of Streptococci is identified by a positive CAMP (Christie, Atkins, Munch-Peterson) test?
Group B
What biochemical test can differentiate between Group A Streptococcus pyogenes and other groups such as Enterococci?
Pyroglutamyl aminopeptidase (pyr) production
Which Streptococcus group shows sensitivity to bacitracin?
Group A
How is Streptococcus pneumoniae differentiated from viridans group Streptococci?
Optochin susceptibility
Which biochemical test can help identify Group B Streptococcus based on the production of a substance that enlarges the area of hemolysis?
CAMP test
What differentiates all group D Streptococci from other groups in terms of bile esculin hydrolysis?
- for esculin hydrolysis
Test your knowledge on the characteristics of Streptococcus bacteria, including their shape, Gram stain results, need for enriched media, and hemolysis on blood agar. Learn about the classification criteria of Streptococcus species.
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