Medical Microbiology: Bacterial Classification Lecture 1
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Questions and Answers

Which of the following staphylococci is often termed 'coagulase negative staphylococci'?

  • S. epidermidis (correct)
  • S. saprophyticus
  • S. aureus
  • S. xylosus
  • What method is used to demonstrate the presence of coagulase in staphylococci by mixing plasma with a suspension of bacteria?

  • DNase production test
  • Slide coagulase test
  • Protein A detection test
  • Tube coagulase test (correct)
  • Which enzyme is possessed by S. aureus but rarely by other staphylococci?

  • DNase (correct)
  • Coagulase
  • Hemolysin
  • Protein A
  • What characteristic is used for differentiating between S. saprophyticus and S. epidermidis?

    <p>Novobiocin sensitivity</p> Signup and view all the answers

    Which staphylococcus possesses a cell-wall antigen known as protein A?

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

    What test is a more rapid and simple method for detecting the presence of coagulase in staphylococci?

    <p>Slide coagulase test</p> Signup and view all the answers

    Which body part is MOST commonly colonized by S. aureus in healthy adults?

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

    What is the Gram staining characteristic of S. aureus when observed under the microscope?

    <p>Gram-positive cocci in clusters</p> Signup and view all the answers

    Which enzyme produced by S. aureus interferes with phagocytosis and enhances tissue invasion?

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

    What is the function of MSCRAMMs in S. aureus?

    <p>Cell adhesion to host cells</p> Signup and view all the answers

    Which biochemical test is NOT typically used for full identification of S. aureus?

    <p>Oxidase test</p> Signup and view all the answers

    What is the primary route of spread for S. aureus according to the text?

    <p>Droplets and skin scales</p> Signup and view all the answers

    Which characteristic is used to further divide medically important bacteria into groups besides cell shape and staining reactions?

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

    Which of the following is a Gram-positive bacterium that is usually associated with humans and is considered clinically important?

    <p>Staphylococcus aureus</p> Signup and view all the answers

    What is the colonial morphology of Staphylococcus saprophyticus like?

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

    Which of the following characteristics is NOT true of Staphylococci?

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

    What is the optimum temperature for the growth of Staphylococci?

    <p>37°C</p> Signup and view all the answers

    In what kind of media do Staphylococci typically grow?

    <p>Simple media</p> Signup and view all the answers

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