lecture 3.7
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12 Terms
what is pili or fimbriae
straight filaments of pilin often used in attachment
what is sex pili
used in conjugation (conjugative pili for DNA conjugation, a way of horizontal gene transfer)
what is flagella
rotary appendages used for movement and chemotaxis
what is each flagellum is a spiral filament of protein monomoer called
flagellin
proton motive force
the motor by which flagellum is rotated
what directions do flagella rotate
clockwise or counter clockwise relative to the cell
what is chemotaxis
the movement of a bacterium in response to chemical gradients (biased random walk)
what causes CCW (counterclockwise) rotation and what happens to the flagella
attractants cause rotation
- Flagella bundle together
- Push cell forward
- “Run”
what causes CW (clockwise) rotation and what happens to the flagella
repellents cause rotation
- Flagellar bundle falls apart
- “Tumble” = bacterium briefly stops, then changes direction
Note 
Flashcards (22)