Microbiology Quiz Chapter 4

10 Questions | Total Attempts: 89

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Microbiology Quiz Chapter 4

Questions based on the chapter 4 of Microbiology an introduction and the learning objectives provided by the teacher.


Questions and Answers
  • 1. 
    We can find bacteria in multiple sizes, shapes with multiple functions as prokaryotic cells. Find which ones fit their nature. (can pick more than one)
    • A. 

      Bacteria that come in spheres and remain attached in chainlike patterns are called streptococci

    • B. 

      The basic shapes of bacteria are coccobacillus, tetrads and spirochete

    • C. 

      A rod-shaped bacterium is called bacillus

    • D. 

      Staphyloccoci are associated with grapelike clusters or broad sheets

    • E. 

      Cocci can be oval, elongated, round, or flattened on one side

    • F. 

      Some environmental conditions can alter the shape of a bacterium

    • G. 

      Spiral bacteria can be either straight or twisted

    • H. 

      A bacterium with an intermediate shape between a coccus and a bacillus is called coccobacillus

  • 2. 
    The main distinctions between prokaryotic and eukaryotic cells is the absence of organelles and the structure of cell walls and membranes.
    • A. 

      True

    • B. 

      False

  • 3. 
    Here are some characteristics about prokaryotic and eukaryotic cells.
    • A. 

      Prokaryotic cells don't have their DNA enclosed within a nucleus

    • B. 

      Eukaryotes DNA is not associated with histones while prokaryotes DNA is consistently associated with those chromosomal proteins

    • C. 

      Archaea contain pseudomurein cell walls

    • D. 

      Prokaryotes divide by binary fission while eukaryotes divide by mitotic spindle

    • E. 

      Cell walls of prokaryotes contain many nutrients like polysaccharides

    • F. 

      B and E are false

    • G. 

      B, C and E are false

    • H. 

      None is false

  • 4. 
    ______, external to the cell wall, it is composed of polysaccharide and/or polypeptide. Can be described as either a capsule or a slime layer. It is also a very important component of ______. 
  • 5. 
    All but one is true to glycocalyx's functions. Which are false? (can pick more than one)
    • A. 

      Slime layer can contribute to bacterial virulence

    • B. 

      Capsules can protect viruses from phagocytosis by the cells of the host.

    • C. 

      Can protect a cell against dehydration

    • D. 

      A glycocalyx's viscosity will enhance the movement of nutrients out of the cell

    • E. 

      None is false

  • 6. 
    The endosymbiotic theory explains that _______ originates from ___________, meaning that larger bacterial cells lost their _____ and engulfed smaller bacterial cells.
  • 7. 
    Chose whatever is true about the movement of materials across membranes.
    • A. 

      Active processes mean the cell must uses ATP energy to move substances from area of low concentration to areas of high concentration (with the concentration gradient)

    • B. 

      Passive processes mean that substances cross the membrane from an area of high concentration to an area of low concentration without any use of ATP energy by the cell

    • C. 

      Simple diffusion, facilitated diffusion and osmosis are parts of active processes

    • D. 

      Simple diffusion and facilitated diffusion involve integral proteins

    • E. 

      Simple diffusion is used especially with the transportation of small molecules across their cell membrane

    • F. 

      Osmotic pressure is the pressure required to prevent the movement of pure water into a solution containing some solutes

    • G. 

      Osmosis is the net movement of solvent molecules across a selectively permeable membrane from an area with a high concentration of solvent molecules to an area of high concentration of solvent molecules

    • H. 

      Group translocation occurs exclusively in prokaryotes.

    • I. 

      When group translocation occurs, the substance is chemically altered during transport across the membrane, making the plasma membrane impermeable to the altered substance so it'll remain inside the cell.

  • 8. 
    Why are mycoplasmas resistant to antibiotics that interfere with cell wall synthesis?
    • A. 

      They are considered viruses

    • B. 

      They have no cell wall

    • C. 

      Since they are the smallest known bacteria, antibiotics can't affect them

    • D. 

      Their sterols containing plasma membranes protect them