Staphylococci
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Questions and Answers

What is the classification of Staphylococci based on?

  • Resistance to heat
  • Production of coagulase enzyme (correct)
  • Color of the pigments produced
  • Size of the cells

    • Which of the following is true about Staphylococci?

  • They are motile
  • They are inhibited by 9% sodium chloride
  • They withstand 50 °C for 30 minutes (correct)
  • They form spores

    • Which species of Staphylococci is coagulase positive?

  • None of these
  • Staphylococcus aureus (correct)
  • Staphylococcus saprophyticus
  • Staphylococcus epidermidis

    • What is the shape and arrangement of Staphylococci cells?

    <p>Spherical cells arranged in clusters</p> Signup and view all the answers

    What type of hemolysis does Staphylococci show on blood agar?

    <p>β- hemolysis</p> Signup and view all the answers

    True or false: Staphylococci are motile bacteria?

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

    True or false: Staphylococci can form spores?

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

    True or false: Staphylococci are inhibited by 3% hexachlorophene?

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

    True or false: Staphylococcus epidermidis is a coagulase negative Staphylococci?

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

    True or false: Staphylococci show beta-hemolysis on blood agar?

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

    True or false: Staphylococci are resistant to heat and drying?

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

    True or false: Staphylococcus aureus is a coagulase negative Staphylococci?

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

    True or false: Staphylococci grow on nutrient agar producing colonies that range in color from gray to deep yellow?

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

    True or false: Staphylococci are facultative anaerobes?

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

    True or false: Staphylococci are classified based on their ability to produce coagulase enzyme?

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

    What is the function of the peptidoglycan layer in S. aureus?

    <p>Endogenous pyrogen &amp; have endotoxin-like activity</p> Signup and view all the answers

    Which toxin is associated with scalded skin syndrome in S. aureus?

    <p>Exfoliatin toxin</p> Signup and view all the answers

    What is the function of teichoic acid in S. aureus?

    <p>Mediates adherence</p> Signup and view all the answers

    Which toxin of S. aureus is most potent in damaging membranes?

    <p>Alpha toxin</p> Signup and view all the answers

    What is the function of Protein A & Capsular Polysaccharide in S. aureus?

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

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