Bacterial Cell Envelopes and Surface Structures Quiz
16 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the outer leaflet of the outer membrane of Gram-negative bacteria mostly comprised of?

  • Phospholipid
  • Peptidoglycan
  • Protein
  • Lipopolysaccharide (LPS) (correct)

    • Which component of Lipopolysaccharide (LPS) anchors it in the outer membrane of Gram-negative bacteria?

  • O-specific polysaccharide
  • Core polysaccharide
  • Phosphates
  • Lipid A (correct)

    • What confers a negative charge to Lipid A in the outer membrane of Gram-negative bacteria?

  • O-specific polysaccharide
  • Hydrophobic tails
  • Core polysaccharide
  • Phosphates (correct)

    • What is another name for Lipid A, a prominent molecule in the outer membrane of Gram-negative bacteria?

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

    Which structure can be used to identify a bacterium?

    <p>O antigen</p> Signup and view all the answers

    What serves to connect the outer membrane to the cell wall in Gram-negative cells?

    <p>Braun’s lipoprotein</p> Signup and view all the answers

    What is the function of porins in the outer membrane?

    <p>Serve as channels for entrance/exit of small molecules</p> Signup and view all the answers

    What is the function of the periplasm in Gram-negative bacteria?

    <p>Buffer between environment and cell</p> Signup and view all the answers

    What is the function of S-layers in bacteria?

    <p>Can provide a periplasmic space or keep external proteins from accessing outer membrane or cell wall</p> Signup and view all the answers

    What are capsules and slime layers composed of?

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

    What are pili and fimbriae primarily composed of?

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

    What is the function of fimbriae?

    <p>Mediates attachment to a surface or another cell</p> Signup and view all the answers

    What is the function of conjugative pili?

    <p>Important for conjugation (transfer of genetic material between bacteria)</p> Signup and view all the answers

    What is the function of Braun’s lipoprotein in Gram-negative cells?

    <p>Connects the outer membrane to the cell wall</p> Signup and view all the answers

    What is the role of the outer membrane in bacteria?

    <p>Acts as a barrier and soaks up or blocks access to many molecules</p> Signup and view all the answers

    What is the function of the periplasm in bacteria?

    <p>Contains many important proteins/functions such as detoxifying harmful compounds</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser