Bacterial Cell Wall Quiz
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Questions and Answers

What is the primary function of the bacterial cell wall?

  • Provide energy for the bacterial cell
  • Facilitate cell division
  • Prevent cells from bursting due to osmotic pressure (correct)
  • Act as a barrier against viruses
  • What is the main structural component of bacterial cell walls?

  • Chitin
  • Cellulose
  • Peptidoglycan (correct)
  • Lipopolysaccharide
  • Which type of bacteria has a thick cell wall and no outer membrane?

  • Eukarya
  • Gram-positive bacteria (correct)
  • Gram-negative bacteria
  • Archaea
  • What is the sugar backbone of peptidoglycan comprised of?

    <p>Alternating N-Acetylglucosamine (NAG) &amp; N-Acetylmuramic Acid (NAM)</p> Signup and view all the answers

    What is the primary linkage connecting the N-acetylglucosamine (GlcNAc, NAG) and N-acetylmuramic acid (MurNAc, NAM) in peptidoglycan chains?

    <p>β(1,4) linkage</p> Signup and view all the answers

    Which type of bacteria typically has a thicker peptidoglycan layer?

    <p>Gram-positive</p> Signup and view all the answers

    What provides additional strength to the Gram-negative bacterial envelope?

    <p>Outer membrane</p> Signup and view all the answers

    Which type of bacteria has interbridges to help connect different peptidoglycan layers?

    <p>Gram-positive</p> Signup and view all the answers

    What is the function of teichoic acids in Gram-positive cell walls?

    <p>Provide cell strength</p> Signup and view all the answers

    What do wall-associated proteins in Gram-positive bacteria typically do?

    <p>Assist in cell adhesion</p> Signup and view all the answers

    What happens to the pores in Gram-positive cell walls during dehydration?

    <p>They close and prevent escape of crystal violet dye</p> Signup and view all the answers

    What is the primary reason for Mycoplasma pneumoniae being considered an unusual bacterium?

    <p>Lack of cell wall</p> Signup and view all the answers

    What happens to the color of Gram-negative bacteria after the decolorizing step in Gram staining?

    <p>They remain pink</p> Signup and view all the answers

    What is the role of teichoic acids in Gram-positive cell walls?

    <p>Trap divalent metal ions</p> Signup and view all the answers

    What is the primary function of the outer membrane in Gram-negative bacteria?

    <p>Serve as a permeability barrier</p> Signup and view all the answers

    What is the specific sequence of the peptide in peptidoglycan for a given bacterium?

    <p>Conserved sequence</p> Signup and view all the answers

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