Bacterial Anatomy

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Author:
kris10leejmu
ID:
191820
Filename:
Bacterial Anatomy
Updated:
2013-01-19 17:38:31
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Microbiology One
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Microbiology
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  1. Are bacteria larger than viruses?
    yes
  2. What are the different components of bacteria?
    • capsule
    • cell wall
    • cell membrane
    • cytoplasm
    • mesosomes
    • flagella
    • pili
    • plasmid
    • endospore
  3. What is the capsule?
    • outmost covering of many, but not all bacteria
    • slimy, jelly like
  4. What is the capsule composed of?
    carbohydrates and protein
  5. What is the function of the capsule?
    • protects agains phagocytosis
    • promotes attachment to objects and to each other
    • produces infectivity - ability to produce disease, if no capsule is produced it may not be pathogenic
    • prevents nutrient loss and dehydration
    • provides antigenicity - causes production of antibodies
  6. What are the two layers of the cell wall?
    • base layer
    • outside layer
  7. What is the function of the cell wall?
    • gives rigidity to bacterial cells
    • maintains shape and size
  8. Which types of bacteria do not have cell walls?
    mycoplasma and spiral bacteria
  9. Which drugs interfere with bacterial cell wall syntheses?
    penicillin
  10. What is another name for a cell membrane?
    cytoplasmic membrane
  11. Which layer is the cell membrane?
    inner most layer
  12. What does the cell membrane do?
    separates cytoplasm from cell wall
  13. Does the cell membrane help keep the cell's shape?
    no
  14. What is the cytoplasm?
    fluid in the cell
  15. What are the two areas of cytoplasm?
    • cytoplasmic area
    • nuclear area
  16. What is in the cytoplasmic area?
    • ribosomes
    • storage granules
  17. What do ribosomes do?
    protein synthesis
  18. What is nucleoid?
    nuclear area of cytoplasm
  19. What is in the nucleoid?
    • rich in DNA
    • transmits this information to new cells during cellular reproduction
  20. What are mesosomes?
    • invaginations of the cell membrane
    • increases surface area of cell membrane for secretion and cell division
  21. What is flagella?
    long, whip-like appendage made of protein
  22. What is the purpose of flagella?
    locomotion and motility
  23. Do we use flagella to identify bacteria?
    no
  24. What is phototaxis?
    move toward or away from the light
  25. What is chemotaxis?
    move in response to chemicals
  26. Can flagella be seen without staining?
    no
  27. What is flagella made of?
    protein
  28. What can antiflagellar antibodies do?
    agglutinate flagella and impairs mobility of the bacteria
  29. What are the four types of arrangement of flagella?
    • monotrichous:  1 at one pole
    • lophotrichous:  tuft at one pole
    • amphitrichous:  1 or tuft at each pole
    • peritrichous:  all around cell
  30. What are pili?
    long whip-like hollow tubes
  31. Can there be more than one pili per cell?
    yes
  32. Which bacteria do we mainly see pili?
    gram negative bacteria
  33. Can we see pili with a light microscope?
    no, has to use a electron microscope
  34. What is the function of pili?
    • do not function in locomotion
    • transfer DNA from one bacterium to another
    • adhesiveness is main function - to other bacteria, to objects
  35. By genetically altering the adhesive tips of their pili, certain bacteria are able to _____ and _____.
    • adhere to and colonize different cell types with different receptors
    • evade antibodies made against the previous pili
  36. What is a plasmid?
    circular, double-stranded, self-replicating unit of DNA
  37. What does plasmid contain?
    contains genes to transfer drug resistance - R factor
  38. What is an endospore?
    a thick-walled, refractile body, able to withstand adverse environmental conditions for long periods, produced within the vegetative cells of certain bacteria
  39. Can all bacteria form spores?
    no
  40. What is another name for endospore?
    spore
  41. Are bacterial spores reproduction?
    no, they are survival form
  42. What happens to the endospore under favorable conditions?
    the spore will germinate to form a vegetative bacterium (functioning form)
  43. What is sporulation?
    formation of a spore
  44. Why are spores formed?
    occurs to allow continuity of life
  45. Do spores have a low or high rate of metabolism?
    low rate of metabolism
  46. Can spores live without nutrients?
    yes, for decades
  47. What are endospores resistant to?
    • heat
    • desiccation
    • chemical (including stain)
  48. Are endospores the same in each cell?
    no, they vary in size, shape, and location
  49. What are the different spore locations within a cell?
    • central
    • terminal (at the end)
    • subterminal (near the end)
  50. Do endospores resist staining?
    yes
  51. What is the common size of bacteria?
    • 0.5 - 1.0 microns in width
    • 2 - 5 microns in length
  52. How big are cocci?
    0.75 - 1.2 microns in diameter
  53. How big are rods?
    width of 0.1 to 2 microns and length of 2 - 5 microns
  54. How big are spirochetes?
    3 - 5 microns long
  55. What are the 4 different shapes of bacteria?
    • coccus (spherical)
    • bacillius (rod shaped)
    • spiral
    • pleomorphic (shape ranges from cocci to rods)
  56. How are bacteria arranged?
    some bacteria remain attached after dividing, forming chains, clusters
  57. What are the different types of arrangements?
    • single - one alone
    • pair - 2 (diplococcus)
    • chain - more than 2 in a line
    • cluster - grape-like bunch
    • tetrad - 4 in a square
    • palisade - chinese letter pattern

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