Medical Microbiology: Gram-Positive Pyogenic Cocci Quiz
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Questions and Answers

What is the morphology of staphylococci?

  • Gram-negative cocci
  • Gram-positive rod-shaped cells
  • Gram-positive spherical cells (correct)
  • Gram-negative bacilli

    • Which species of staphylococci is coagulase-positive and a major pathogen for humans?

  • Streptococcus
  • Staphylococcus epidermidis
  • Staphylococcus aureus (correct)
  • Staphylococcus saprophyticus

    • What type of infections can be caused by some staphylococci?

  • Urinary tract infections
  • Suppuration, abscess formation, and septicemia (correct)
  • Gastrointestinal infections
  • Respiratory infections

    • What differentiates Staphylococcus aureus from other staphylococcal species?

    <p>It is coagulase-positive</p> Signup and view all the answers

    What is the most common type of food poisoning caused by staphylococci?

    <p>Heat-stable staphylococcal enterotoxin poisoning</p> Signup and view all the answers

    What is the metabolic characteristic of staphylococci?

    <p>They ferment carbohydrates and produce pigments varying from white to deep yellow</p> Signup and view all the answers

    What is the classification method based on the sequence of the spa locus in S. aureus?

    <p>Staphylococcal protein A typing</p> Signup and view all the answers

    Which species of Staphylococci causes urinary tract infections in young women?

    <p>S. saprophyticus</p> Signup and view all the answers

    What method is based on the genomic restriction digestion for S. aureus classification?

    <p>Pulsed field gel electrophoresis (PFGE)</p> Signup and view all the answers

    What does the capsular polysaccharide A protect the organism from?

    <p>Opsonization</p> Signup and view all the answers

    Which cell surface antigen disrupts phagocytosis and is possessed by 90% of S. aureus strains?

    <p>Protein A</p> Signup and view all the answers

    Which enzyme converts fibrinogen to fibrin, coating the organisms to inhibit phagocytosis?

    <p>Coagulase</p> Signup and view all the answers

    Which enzyme is important in the pathogenesis of boils by digesting fats?

    <p>Lipases</p> Signup and view all the answers

    What type of toxins are capable of efficiently lysing white blood cells?

    <p>Membrane damaging toxins (exotoxins)</p> Signup and view all the answers

    What does Panton-valentine leukocidin damage?

    <p>White blood cells</p> Signup and view all the answers

    Which classification method is used for methicillin resistant S. aureus based on gel electrophoresis banding pattern following PCR amplification?

    <p>Staphylococcal Cassette Chromosome typing</p> Signup and view all the answers

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