16 Questions
What is the morphology of staphylococci?
Gram-positive spherical cells
Which species of staphylococci is coagulase-positive and a major pathogen for humans?
Staphylococcus aureus
What type of infections can be caused by some staphylococci?
Suppuration, abscess formation, and septicemia
What differentiates Staphylococcus aureus from other staphylococcal species?
It is coagulase-positive
What is the most common type of food poisoning caused by staphylococci?
Heat-stable staphylococcal enterotoxin poisoning
What is the metabolic characteristic of staphylococci?
They ferment carbohydrates and produce pigments varying from white to deep yellow
What is the classification method based on the sequence of the spa locus in S. aureus?
Staphylococcal protein A typing
Which species of Staphylococci causes urinary tract infections in young women?
S. saprophyticus
What method is based on the genomic restriction digestion for S. aureus classification?
Pulsed field gel electrophoresis (PFGE)
What does the capsular polysaccharide A protect the organism from?
Opsonization
Which cell surface antigen disrupts phagocytosis and is possessed by 90% of S. aureus strains?
Protein A
Which enzyme converts fibrinogen to fibrin, coating the organisms to inhibit phagocytosis?
Coagulase
Which enzyme is important in the pathogenesis of boils by digesting fats?
Lipases
What type of toxins are capable of efficiently lysing white blood cells?
Membrane damaging toxins (exotoxins)
What does Panton-valentine leukocidin damage?
White blood cells
Which classification method is used for methicillin resistant S. aureus based on gel electrophoresis banding pattern following PCR amplification?
Staphylococcal Cassette Chromosome typing
Test your knowledge of Gram-Positive Pyogenic Cocci such as Staphylococcus, Streptococcus, and Enterococcus with this quiz. Learn about their morphology, metabolism, and bacteriology.
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