Microbiology Unit 12 - Staphylococcus Genus Definitions
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Questions and Answers

What is the study of general principles of scientific classification and naming organisms known as?

  • Nomenclature
  • Taxonomy (correct)
  • Evolutionary relationships
  • Phenotypic similarities
  • How are the family and genus names of microorganisms typically formatted according to international rules?

  • Italicized (correct)
  • In parentheses
  • Underlined
  • Bolded
  • Which enzyme is used to divide Staphylococci into pathogenic and relatively nonpathogenic strains?

  • Lipase
  • Coagulase (correct)
  • Amylase
  • Catalase
  • Which species of Staphylococcus is characterized as very virulent and resistant to dessication, temperature, and salt despite not forming spores?

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

    What distinguishes Staphylococcus coagulase-negative from Staphylococcus aureus?

    <p>Lack of coagulase synthesis</p> Signup and view all the answers

    Which term refers to the practical use of a classification scheme for organisms?

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

    Based on what characteristic can organisms be organized into progressively more inclusive groups (taxons)?

    <p>Phenotypic similarities or evolutionary relationships</p> Signup and view all the answers

    Which component of the Staphylococcus genus is responsible for synthesis of the enzyme coagulase?

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

    Which term refers to the systematic naming of organisms based on international rules according to their characteristics?

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

    What distinguishes Staphylococcus aureus from Staphylococcus epidermidis and Staphylococcus saprophyticus?

    <p>Virulence and multiple pathogenicity factors</p> Signup and view all the answers

    Which of the following is true about S. aureus and S. epidermidis in the oral cavity?

    <p>They are frequently isolated in the oral cavity but in small quantities</p> Signup and view all the answers

    In which of the following conditions can Staphylococci be found in the oral cavity?

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

    What is the significance of S. aureus and S. epidermidis when isolated from polymicrobial infectious processes?

    <p>Their significance as a pathogen is unknown</p> Signup and view all the answers

    Where can cavernous sinus thrombosis originate from?

    <p>Infection in the nose, sinuses, ears, or teeth</p> Signup and view all the answers

    What type of infection can result in facial malignant staphylococcal infection?

    <p>Spread of infection from teeth or sinuses</p> Signup and view all the answers

    In which of the following dental conditions can Staphylococci be found?

    <p>Periapical infections</p> Signup and view all the answers

    What should be considered when isolating Staphylococci from cultures of the oral cavity?

    <p>The likelihood of contamination from skin</p> Signup and view all the answers

    What is the significance of S. aureus and S. epidermidis being present in dental plaque of immunocompromised patients?

    <p>They might indicate a potential risk for opportunistic infections</p> Signup and view all the answers

    What should be taken into account when sampling for Staphylococci in the oral cavity?

    <p>Possible contamination from skin</p> Signup and view all the answers

    What can Staphylococci indicate when found in cultures from the oral cavity?

    <p>Potential opportunistic pathogens if conditions allow</p> Signup and view all the answers

    Which statement about Staphylococcus aureus is FALSE?

    <p>It is catalase negative.</p> Signup and view all the answers

    What is the main difference between Staphylococcus aureus and Coagulase-Negative Staphylococci?

    <p>Their involvement in colonization and pathogenesis.</p> Signup and view all the answers

    Which toxin is NOT produced by Staphylococcus aureus?

    <p>Tetanolysin.</p> Signup and view all the answers

    In which type of infection would you expect to see folllowulitis, furuncle, and impetigo?

    <p>Purulent infections</p> Signup and view all the answers

    What is the treatment of choice for methicillin-resistant Staphylococcus aureus (MRSA)?

    <p>Glycopeptides like vancomycin</p> Signup and view all the answers

    Which factor is essential for the infection by coagulase-negative Staphylococci?

    <p>Presence of foreign bodies or immunodeficiency</p> Signup and view all the answers

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