Bacterial 1
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Questions and Answers

What is the main permeability barrier in gram-negative bacteria due to the presence of porins?

  • Cell wall
  • Outer membrane (correct)
  • Cytoplasmic membrane
  • Nucleoid
  • Which component of bacterial cells is a rigid layer outside the cytoplasmic membrane that confers structural strength?

  • Cell wall (correct)
  • Plasmid
  • Periplasm
  • Ribosomes
  • What type of cell lacks a membrane-enclosed nucleus and other organelles?

  • Prokaryote (correct)
  • Eukaryote
  • Archaea
  • Extremophiles
  • In gram-negative bacteria, what is the gel-like region between the cytoplasmic membrane and the LPS layer called?

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

    What type of staining procedure categorizes bacterial cells into gram-positive or gram-negative based on their cell wall composition?

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

    What defines a prokaryotic cell?

    <p>Lack of a membrane-enclosed nucleus</p> Signup and view all the answers

    Which structure is found in all cells, both prokaryotic and eukaryotic?

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

    What is the function of ribosomes in a cell?

    <p>Production of new proteins</p> Signup and view all the answers

    Which component adds structural strength to some cells?

    <p>Cell wall</p> Signup and view all the answers

    Where is the genetic material located in a prokaryotic cell?

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

    What is the main structural component of the cell wall in gram-positive bacteria?

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

    Which type of bacteria has an outer membrane in addition to the cell wall?

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

    What is the function of the cytoplasmic membrane in bacterial cells?

    <p>Form a permeability barrier and anchor for membrane proteins</p> Signup and view all the answers

    What is the function of peptidoglycan in bacterial cell walls?

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

    What is the approximate width of the cytoplasmic membrane in bacterial cells?

    <p>~8-10nm</p> Signup and view all the answers

    What is the purpose of Gram staining in microbiology?

    <p>To differentiate bacteria into gram-positive and gram-negative based on cell wall composition</p> Signup and view all the answers

    Which of the following is NOT a common morphological form of bacteria?

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

    What is the primary significance of extremophiles in microbiology?

    <p>They can survive and thrive in extreme environments</p> Signup and view all the answers

    Which of the following bacterial phyla is NOT listed as one of the major ones cultural bacteria belong to?

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

    What did Louis Pasteur develop methods for during his work on spontaneous generation?

    <p>Preparing sterile cultures</p> Signup and view all the answers

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