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

Which structure can be used to identify a bacterium?

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

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

<p>Buffer between environment and cell (B)</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 (A)</p> Signup and view all the answers

What are capsules and slime layers composed of?

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

What are pili and fimbriae primarily composed of?

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

What is the function of fimbriae?

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

What is the function of conjugative pili?

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

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser