QUIZ ONLINE UJI NYALI 3 STRUKTUR SEL PROKARIOT

20 Questions  I  By Fabiounsoed
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 Quiz Online Uji Nyali 3 Struktur Sel Prokariot
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  • 1. 
    The plasma membrane and most other membranes are composed of a lipid bilayer in which integral proteins are buried
    • A. 

      TRUE

    • B. 

      FALSE


  • 2. 
    Procaryotic cells are usually smaller than eucaryotic cells.
    • A. 

      TRUE

    • B. 

      FALSE


  • 3. 
    Another common bacterial shape is that of a rod, often called ________
    • A. 

      Coccus

    • B. 

      Bacillus

    • C. 

      Pleomorphic


  • 4. 
    Most procaryotes have strong cell walls that give them shape.
    • A. 

      True

    • B. 

      False


  • 5. 
    The most commonly encountered bacteria are roughly spherical. The microbiological term describing this shape is _________
    • A. 

      Coccus

    • B. 

      Bacillus

    • C. 

      Pleomorphic


  • 6. 
    The significance of the plasma membrane is that
    • A. 

      It selectively allows some molecules to pass into the organism

    • B. 

      It prevents movement of molecules out of the organism

    • C. 

      It is the site of protein synthesis

    • D. 

      All of the above


  • 7. 
    What is a plasmid?
    • A. 

      Self-replicating segment of double stranded DNA

    • B. 

      Self-replicating segment of single stranded RNA

    • C. 

      A bacterial chromosome


  • 8. 
    Some bacteria are considered pleomorphic. This means
    • A. 

      They are shaped like bent rods

    • B. 

      They have a corkscrew shape

    • C. 

      They do not have just one shape

    • D. 

      They are not either bacilli or cocci.


  • 9. 
    Gas vesicles in bacteria
    • A. 

      Help move cells to optimal nutrient levels.

    • B. 

      Store oxygen for growth anaerobically

    • C. 

      Are bounded by a lipid bilayer membrane.

    • D. 

      Are bounded by a membrane impervious to gas


  • 10. 
    Magnetostomes in bacteria
    • A. 

      Help cells attach to metal objects.

    • B. 

      Help cells to magnetically attach to each other

    • C. 

      Help cells to float on the surface of fresh water ponds

    • D. 

      Help cells to orient in the earth's magnetic field


  • 11. 
    The 70S procaryotic ribosomes consist of
    • A. 

      Two 40S subunits

    • B. 

      A 50S and a 30S subunit

    • C. 

      A 40S and a 30S subunit

    • D. 

      A 50S and a 20S subunit.


  • 12. 

    Gram positive cells
    • A. 

      Have a second, outer membrane that helps retain the crystal violet stain

    • B. 

      Have multiple layers of peptidoglycan that help retain the crystal violet stain

    • C. 

      Have a thick capsule that traps the crystal violet stain

    • D. 

      Have a periplasmic space that traps the crystal violet.


  • 13. 
    The outer membrane of Gram negative cells is more permeable than the plasma membrane because
    • A. 

      LPS is larger than most membrane phospholipids

    • B. 

      Lipoproteins stretch the outer membrane

    • C. 

      Porin proteins establish holes in the outer membrane.

    • D. 

      The core polysaccharide spans the lipid bilayer


  • 14. 
    The most important role of the prokaryotic cell wall is to
    • A. 

      Maintain the shape of the cell

    • B. 

      Protect the cell from osmotic pressures

    • C. 

      Prevent ions from diffusing away from the cell

    • D. 

      Block the effects of antibiotics like penicillin


  • 15. 
    Fimbriae
    • A. 

      Attach bacteria to various surfaces

    • B. 

      Cause bacteria move through fluids

    • C. 

      Sense changes in nutrient concentration

    • D. 

      Are pathways for the secretion of exoenzymes


  • 16. 
    A bacillus bacterium with a single flagellum at each end is described as
    • A. 

      Monotrichous

    • B. 

      Amphitrichous

    • C. 

      Lophotrichous

    • D. 

      Peritrichous


  • 17. 
    Which of the following is not true about bacterial flagella?
    • A. 

      Most of their length consists of a hollow, rigid protein tube

    • B. 

      They are constructed largely of a single protein called flagellin

    • C. 

      They spin like wheels, either clockwise or counterclockwise

    • D. 

      They use cytoplasmic ATP as their primary energy source.


  • 18. 
    Bacteria accomplish chemotaxis by
    • A. 

      Steering toward better growth conditions.

    • B. 

      Making long, uninterrupted runs when conditions are good.

    • C. 

      Frequently stopping and tumbling to better sense good conditions.

    • D. 

      Stopping movement when conditions are good


  • 19. 
    The most important role of the prokaryotic cell wall is to
    • A. 

      Maintain the shape of the cell

    • B. 

      Protect the cell from osmotic pressures

    • C. 

      Prevent ions from diffusing away from the cell.

    • D. 

      Block the effects of antibiotics like penicillin


  • 20. 
    What is the purpose of bacterial endospores?
    • A. 

      Allow the bacterium to make hundreds of "seeds" to spread on the wind

    • B. 

      Help the bacterium to differentiate into faster growing stages of bacteria

    • C. 

      Allow the bacterium to survive the absence of oxygen

    • D. 

      Allow the bacterium to survive extended periods of heat or dryness.


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