Biology Quiz: Gram-Positive and Gram-Negative Bacteria
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Questions and Answers

What is the main function of the central mesosome in Gram-positive bacteria?

  • Transport of extracellular enzymes outside the cell wall
  • Site of protein synthesis.
  • Protect the cell membrane from injuries (correct)
  • Taking part in cell division and DNA replication

    • The outer membrane of Gram-negative cells is more permeable than the plasma membrane because

  • Porin proteins establish holes in the outer membrane.
  • LPS is larger than most membrane phospholipids. (correct)
  • The core polysaccharide spans the lipid bilayer.
  • Lipoproteins stretch the outer membrane.

    • Which of the following statements about bacterial flagella is true?

  • The filaments are composed of protein subunits called flagellin.
  • All motile bacteria have flagella. (correct)
  • Flagella increase in length by adding new material to the tip not the base.
  • The flagella move cells by acting as propellers.

    • Which one of the following forms of immunity to viruses would be least likely to be life long?

    <p>Cell-mediated immunity</p> Signup and view all the answers

    Penicillin and lysozyme are similar in that

    <p>both affect cell walls</p> Signup and view all the answers

    What mechanism allows HIV to evade the immune system?

    <p>By constantly mutating its surface proteins</p> Signup and view all the answers

    Study Notes

    Bacterial Cell Structure and Function

    • The main function of the central mesosome in Gram-positive bacteria is to protect the cell membrane from injuries.
    • In Gram-negative cells, the outer membrane is more permeable than the plasma membrane because LPS is larger than most membrane phospholipids.

    Bacterial Flagella

    • Not all motile bacteria have flagella, but those that do can direct their movement toward a source of nutrients.
    • Flagella increase in length by adding new material to the tip, not the base.
    • The filaments of flagella are composed of protein subunits called flagellin.

    Immunity to Viruses

    • Passive immunity is a form of immunity to viruses that would be least likely to be lifelong.
    • Active immunity, on the other hand, is a form of immunity that can be lifelong.

    Antimicrobial Agents

    • Penicillin and lysozyme are similar in that they both affect cell walls.

    Viral Pathogens

    • HIV has the ability to evade the immune system.
    • Herpes viruses have distinct properties that characterize them.

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    Description

    Test your knowledge of bacteria cell structure and functions with this quiz on Gram-positive and Gram-negative bacteria.

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