Bacterial Cell Membrane Function Quiz
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Bacterial Cell Membrane Function Quiz

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Questions and Answers

What is the role of the bacterial cell membrane in maintaining a constant inner bacterial environment?

  • Controlling transport mechanisms (correct)
  • Maintaining bacterial shape
  • Participating in cell division
  • Determining Gram character

    • Which of the following best describes the Gram-negative cell wall?

  • Contains teichoic acid which is extremely toxic to the human body
  • Contains Lipopolysaccharide (LPS) which is non-toxic to the human body
  • Contains teichoic acid which is non-toxic to the human body
  • Contains Lipopolysaccharide (LPS) which is extremely toxic to the human body (correct)

    • Which statement accurately describes the medical importance of Gram-negative bacteria's lipopolysaccharide (LPS)?

  • Lipopolysaccharide is extremely toxic to the human body and is called the endotoxin
  • Lipopolysaccharide is released only when the bacterial cells are lysed, and is responsible for fever, hypotension, and shock caused by gram-negative organisms
  • Has a thin layer of peptidoglycan (2 sheets) which forms only 5-10% of the cell wall material is located inside the outer layer of LPS
  • All of the above (correct)

    • Which process requires sterilization by boiling at 100°C for 20-30 minutes to free instruments and products from spores for medical use?

    <p>Spore elimination</p> Signup and view all the answers

    What is a distinguishing feature of Gram-negative cell walls compared to Gram-positive cell walls?

    <p>Thin layer of peptidoglycan (2 sheets forming 5-10% of the cell wall material) located inside the outer layer of LPS</p> Signup and view all the answers

    What is true about Gram-negative cell walls?

    <p>Outer membrane contains porins for selective permeability</p> Signup and view all the answers

    What is the outer layer of lipopolysaccharides in gram-negative bacteria called?

    <p>Somatic O antigen</p> Signup and view all the answers

    When is the endotoxin released in gram-negative bacteria?

    <p>When bacterial cells are lysed</p> Signup and view all the answers

    Which component of lipopolysaccharides is responsible for the toxicity in gram-negative bacteria?

    <p>Lipid A</p> Signup and view all the answers

    What symptoms are caused by the fever, hypotension, and shock in the human body due to lipopolysaccharides?

    <p>Toxic shock syndrome</p> Signup and view all the answers

    Where is the Somatic O antigen located in gram-negative bacteria?

    <p>Outer layer of lipopolysaccharides</p> Signup and view all the answers

    What is the function of Lipid A in lipopolysaccharides of gram-negative bacteria?

    <p>Responsible for toxicity</p> Signup and view all the answers

    What is the main function of the bacterial cytoplasmic membrane?

    <p>Controlling transport mechanisms</p> Signup and view all the answers

    Which statement best describes the Gram-negative cell wall?

    <p>Contains Lipopolysaccharide (LPS) which is extremely toxic to the human body</p> Signup and view all the answers

    What is the role of Lipopolysaccharide (LPS) in Gram-negative bacteria?

    <p>All of the above</p> Signup and view all the answers

    Which aspect determines the reaction of bacterial cells to the Gram stain?

    <p>Bacterial cytoplasmic membrane function</p> Signup and view all the answers

    What is the medical importance of bacterial spores?

    <p>They are highly resistant to environmental stressors</p> Signup and view all the answers

    Why is Lipopolysaccharide (LPS) considered a critical component in Gram-negative bacteria?

    <p>It triggers immune responses and can cause severe symptoms in humans</p> Signup and view all the answers

    Study Notes

    Bacterial Cell Membrane Function

    • Maintains a constant inner bacterial environment by controlling transport mechanisms
    • Does not determine cell reaction to Gram stain, play a role in cell division, or maintain shape and Gram character of bacteria

    Gram Negative Cell Wall

    • Contains Lipopolysaccharide (LPS) which is extremely toxic to the human body and is called the endotoxin
    • LPS is released only when the bacterial cells are lysed, and is responsible for the fever, hypotension and shock caused by gram negative organisms
    • Has a thin layer of peptidoglycan (2 sheets) which forms only 5-10% of the cell wall material, located inside the outer layer of LPS

    Gram Positive Cell Wall

    • Contains a thick peptidoglycan layer (40 sheets) responsible for bacterial rigidity and shape
    • Has teichoic and lipoteichoic acid, which are major surface components, immunogenic, and responsible for Toxic shock symptoms and adherence to host cells

    Periplasmic Space

    • Is the space between the outer and inner layer of cytoplasmic membrane
    • Filled with a gel solution of proteins
    • Is the site of β-lactamase enzymes in some bacteria that degrade penicillins and other β-lactam drugs

    Functions of Cell Wall

    • Maintains the shape of bacteria
    • Osmotically insensitive, protecting the cytoplasmic membrane against bursting in hypotonic solutions

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    Description

    Test your knowledge on bacterial cell membrane function with these multiple-choice questions. Identify true statements regarding the role of the cell membrane in maintaining shape, Gram stain reaction, and inner bacterial environment.

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