Plasma Membrane Structure in Bacteria and Archaea
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Questions and Answers

Which type of membrane structure is characteristic of Archaea?

  • Monolayer membrane with fatty acid tails
  • Monolayer membrane with hydrocarbon tails
  • Bilayer membrane with ether bonds (correct)
  • Bilayer membrane with fatty acid tails

What type of lipid is specific to Eukaryotic plasma membranes?

  • Phospholipids with hydrocarbon tails
  • Sterols (correct)
  • Archeaols
  • Hopanoids

What is a distinguishing feature of Gram-positive bacterial cell walls?

  • Thinner wall compared to Gram-negative bacteria
  • Thicker layer of peptidoglycan (correct)
  • Presence of sterols in the wall
  • Multiple layers including outer membranes

Which component anchors the cell wall to the plasma membrane in Gram-positive bacteria?

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

What is the bond that connects the tail to the head in Archaeal phospholipids?

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

Why do Mycoplasma Spp. not require a cell wall?

<p>Because they reside inside a host (D)</p> Signup and view all the answers

What is the role of Braun’s lipoproteins in bacterial cell walls?

<p>Anchoring different layers together (B)</p> Signup and view all the answers

Which enzyme is responsible for the formation of crosslinking in the bacterial cell wall?

<p>DD-transpeptidase (D)</p> Signup and view all the answers

What differentiates Gram-positive cell walls from Gram-negative cell walls in Gram staining?

<p>Thickness of the cell wall (A)</p> Signup and view all the answers

What is the function of lipid A in Lipopolysaccharide (LPS) found in Gram-negative cells?

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

What happens when there is a release of LPS in the body, leading to septic shock?

<p>Body wide vasodilation and sudden drop in blood pressure (A)</p> Signup and view all the answers

What unique feature is present in pseudopeptidoglycan that makes it resistant to lysozymes?

<p>Beta-1,3-glycosidic bonds (B)</p> Signup and view all the answers

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