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15 Cards in this Set
- Front
- Back
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How are most prokaryotic species motile |
Through usage of flagella |
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What are flagella |
Fine helices of polymerized subunits of a single protein called flagelln
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What is the helical protical of the flagellum driven by |
An intricate motor embedded i nthe cell wall and cytoplasmic membrane that rotates in response to ATP-dependent proton translocation across the cytoplasmic membrane in a fashion though to be similar to that of the ATP synthase rotor |
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What are the different arrangements of the flagellum |
*Polar *Lophotrichous *Petricious |
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What is a polar flagellum |
Single flagella at the end of a rod-shaped cell |
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What is lophotrichous flagella |
Tufts of two or more polar flagella |
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What is petricious arrangement of flagella |
Flagella distributed evenly over the surface of the cell
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What influences the speed and motion of the cell |
Distribution of flagella
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What do we view wet mounts under |
400 x magnification (40x objective) Phase contrast (Ph2) |
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When viewing wet mounts of non motile species and there are movement what are you actually seeing |
*Brownian motion
*Shear flow of the liquid sample |
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What do you see with Brownian motion |
Cells vibrate or tumble |
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What do you see with shear flow of liquid sample |
All cells move slowly in the same direction
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Cells with a single polar flagellum move how |
Quickly and somewhat erratically |
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How do petricious cells move |
More linearly in a slower, stately manner |
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When doing a motility test how should the agar concentration be |
Low |
