Bacterial Peptidoglycan Biosynthesis Quiz
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Questions and Answers

What is the main component of bacterial peptidoglycans?

  • Polymeric chains of amino sugars (correct)
  • Oligopeptide chains
  • UDP-N-acetyl muramic acid
  • N-acetyl muramyl pentapeptide
  • Which process involves the formation of a huge three-dimensional structure in bacterial peptidoglycans?

  • Cross linking of individual peptidoglycan strands (correct)
  • Synthesis of N-acetyl muramyl pentapeptide
  • Formation of the polysaccharide chain
  • Addition of PEP and reduction of the pyruvyl group
  • What is the first step in the biosynthesis of peptidoglycan involving S. aureus?

  • Cross linking of individual peptidoglycan strands
  • Formation of the polysaccharide chain
  • Addition of PEP and reduction of the pyruvyl group
  • Synthesis of N-acetyl muramyl pentapeptide (correct)
  • How is UDP-N-acetyl muramic acid synthesized from UDP-N-acetyl glucosamine?

    <p>Addition of PEP and reduction of pyruvyl group</p> Signup and view all the answers

    Which process in peptidoglycan synthesis involves the addition of one residue at a time without mRNA templates and ribosomes?

    <p>Building the peptide chain</p> Signup and view all the answers

    What provides specificity in the synthesis of N-acetyl muramyl pentapeptide?

    <p>Sequence shown in ATP dependent ligases</p> Signup and view all the answers

    What are the three classes of N-linked glycoproteins mentioned in the text?

    <p>High mannose, complex oligosaccharide, and hybrid oligosaccharide</p> Signup and view all the answers

    Which class of N-linked glycoproteins contains elements of both high mannose and complex chains?

    <p>Hybrid oligosaccharide</p> Signup and view all the answers

    What type of sugars are found in the complex oligosaccharides of N-linked glycoproteins?

    <p>N-acetyl glucosamine, L-fucose, and NANA</p> Signup and view all the answers

    What role do rigid cell walls play in bacteria?

    <p>Regulate osmotic pressure within the cell</p> Signup and view all the answers

    Which component of bacterial cell walls gives bacteria their characteristic shapes?

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

    What defines a hybrid oligosaccharide in N-linked glycoproteins?

    <p>Contains elements of both high mannose and complex chains</p> Signup and view all the answers

    What is the major difference in the cell wall structure between Gram positive and Gram negative bacteria?

    <p>Gram positive bacteria have a thick peptidoglycan layer, while Gram negative bacteria have a thin peptidoglycan layer.</p> Signup and view all the answers

    Which type of linkage connects the N-acetyl glucosamine and N-acetyl muramic acid in the bacterial cell wall polysaccharide chains?

    <p>β 1→4 linkages</p> Signup and view all the answers

    How is the tetrapeptide attached to the lactic acid moiety of N-acetyl muramic acid in the bacterial cell wall structure?

    <p>Through a γ-carboxyl linkage</p> Signup and view all the answers

    Which amino acids make up the tetrapeptide that is attached to the lactic acid moiety of N-acetyl muramic acid?

    <p>L-alanine, D-glutamate, L-lysine, D-alanine</p> Signup and view all the answers

    How are adjacent polysaccharide chains linked together in the bacterial cell wall structure?

    <p>Through pentapeptide linkages</p> Signup and view all the answers

    Which group is the glycine tetrapeptide attached to in the bacterial cell wall structure?

    <p>ε-amino group of each lysine residue</p> Signup and view all the answers

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