Card Set Information
Flagella and pili are what?
External structures extending from the cell membrane through the cell wall and beyond it.
Flagella (pl), Flagellum (sin)
External structure as way of movement w/speed and apparent purpose.
Long, thin, helical appendages.
Composed of flagellin - Protein subunits.
Bacteria w/ a
flagellum located at
one at ea. end
2 or more
one or both ends
Bacteria w/ flagella
Cocci rarely have flagella.
Flagella: Gm (+)
1 outer protein ring to cell wall/thick peptidoglycan.
1 inner protein ring to cell membrane.
Attachement site for flagellum.
Consists of protein other than flagellin.
Contains hooklike structure and basal body.
Basal Body - central rod/shaft surrounded by a set of rings.
Flagella: Gm (-)
3 main parts = filament, hook, basal body.
: 2 outer rings + rod + 2 inner rings
4 rings =
2 Outer rings
: Cell wall = outer membrane + peptidoglycan
2 Inner rings
: Cell membrane; lipopolysaccharide
Bacteria move toward or away from substances in their environment by a nonrandom process.
- lengthen runs, reduces freq of tumbles.
- shortens run, inc freq of tumbles.
lower [harmful subs]
- longer runs, few tumbles
higher [harmful subs]
- short urns, many tumbles
External motility structure composed of axial filaments; lie between outer sheath and cell wall; anchored at one end of a cell.
Spirochete - corkscrew rotation movement
Pili (pl) , Pilus (sin)
Tiny hollow projection that allow attachements to surfaces. Not involved in movement.
AKA - F pili / sex pili.
Donor cell forms hollow bridge between similar bacterial cells for DNA transfer.
One of the sources of antibiotic-resistant baceria.
AKA - Attachment pili
Contribute to the pathogenicity (ability to produce disease) by enhancing colonization.
N. gonorrhoeae - attaches to epithelial cells of urogenital system.
- Aerobic bacteria forming a shiny/fuzzy thin layer at the air-water interface of a broth culture.
All polysaccharide containing substances found external to pro. cell wall. Usually sticky.
- most organized and thickest, prevents phagocytosis, increases pathenogenicity.
- unorganized, thin, loose. All bacteria have at least a thin slime layer.