MB 230 1:3-4

  1. What's in a cell envelope
    • Plasma membrane
    • Cell wall
    • Glycocalyx
    • s-layer
  2. What is a Glycocalyx?
    Polysaccharide or sugar matrix outside the cell. Either capsules or slime layers.
  3. s-layer or surface layers are made of____. What do they do
    • 1) monomolecular protein layers (100's of proteins.
    • 2) They protect against ions/PH, osmotic stress, enzymes, and predators. They promote adhesion to surfaces.
  4. what does the slime layer of the Glycocalys do
    • 1) facilitates motility,
    • 2) form a dificult to remove biofilm,
    • 3) protects against antibiotics.
  5. Myoplasms are cells ___ a cell wall.
    Their size is ___.
    They have _____ peptedoglycan layer.
    Some cause _____.
    and are an____ _____ bacteria
    • no,
    • as small as the largest virus,
    • no peptedoglycan,
    • disease,
    • obligate intracellular bacteria
  6. What are Pili, and name two types
    • Pili are long hair like appendages.
    • Sex pili for conjugation.
    • Type IV pili for motion, which is used like a hook.
  7. Describe Flagellum?
    Long whip-like structures often used for movement, but some are specialized
  8. monotrichous flagelar arrangement
    one hair on one end
  9. amphitrichous
    one flagellum on each end
  10. Liphotrichous
    Clumps of flagella on one end or both ends
  11. Peritrichous
    flegella cover the bacterium
  12. What is doubling time or generation time?
    time it takes to undergo binary fission.
  13. How do bacteria reproduce?
    Binary fission, which is asexual reproduction where one cell becomes 2 identical cells.
  14. What shape is cocus bacteria
    circular ball
  15. Shape of bacilllus
  16. what shape are 3 spiral bacteria?
    • vibro: Comma
    • Spirilla: thick rigid spiral
    • Spirochete: thin flexible spira;
  17. Staphylo-
    clumps of
  18. strepto-
    chains of
  19. filamentous
  20. Pleomorphic
    Irregular: does not fit into any other category.
  21. 1) mycobacteriam are gram____, but ___ stain purple because of ____ __. 2) How do you stain them?
    • 1)gram-negative, but don't stain purple because of waxy lipids.
    • 2) Acid fast staining.
  22. Mycoplasma characteristics:
    • 1) as small as the largest virus.
    • 2) obligate intracellular bacteria (must live in another cell, and can cause disease.
    • 3) neither gram-negative or gram-positive
Card Set
MB 230 1:3-4
MB 230 1:3-4