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 (C)</p> Signup and view all the answers

What distinguishes Staphylococcus coagulase-negative from Staphylococcus aureus?

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

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

<p>Identification (A)</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 (A)</p> Signup and view all the answers

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

<p>Staphylococcus aureus (D)</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 (A)</p> Signup and view all the answers

What distinguishes Staphylococcus aureus from Staphylococcus epidermidis and Staphylococcus saprophyticus?

<p>Virulence and multiple pathogenicity factors (C)</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 (B)</p> Signup and view all the answers

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

<p>Glossitis (C)</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 (A)</p> Signup and view all the answers

Where can cavernous sinus thrombosis originate from?

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

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

<p>Periapical infections (C)</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 (A)</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 (D)</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 (C)</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 (C)</p> Signup and view all the answers

Which statement about Staphylococcus aureus is FALSE?

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

Which toxin is NOT produced by Staphylococcus aureus?

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

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

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

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

<p>Glycopeptides like vancomycin (B)</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 (D)</p> Signup and view all the answers

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