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Questions and Answers
What happens when the flagellar motors reverse?
What happens when the flagellar motors reverse?
- The flagella detach from the cell.
- The cell stops moving completely.
- The bundle flies apart and the cell tumbles wildly. (correct)
- The flagellar motors speed up.
How does the cell's motility change during periods of tumbling (twiddles)?
How does the cell's motility change during periods of tumbling (twiddles)?
- The cell moves in a straight line.
- The cell swims in a different direction after each tumble. (correct)
- The cell increases its speed.
- The cell spins on its axis.
What characterizes a 'run' in terms of bacterial motility?
What characterizes a 'run' in terms of bacterial motility?
- Continuous swimming in one direction. (correct)
- Rapid spinning of the cell.
- Complete cessation of movement.
- Uncontrolled tumbling of the cell.
How does the flagellar bundle behave when the flagellar motors resume their normal direction?
How does the flagellar bundle behave when the flagellar motors resume their normal direction?
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What happens to the cell's direction of swimming after each tumble?
What happens to the cell's direction of swimming after each tumble?
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Study Notes
Flagellar Motor Reversal and Bacterial Motility
- When the flagellar motors reverse, the cell's direction of swimming is altered, leading to a change in motility.
Tumbling (Twiddles) Periods
- During tumbling periods, the cell's motility changes, characterized by brief, random movements.
Characteristics of a 'Run'
- A 'run' in bacterial motility is characterized by a period of smooth, consistent movement in a single direction.
Flagellar Bundle Behavior
- When the flagellar motors resume their normal direction, the flagellar bundle unravels and re-forms, allowing the cell to regain its directional swimming.
Post-Tumble Directional Change
- After each tumble, the cell's direction of swimming changes, resulting in a new, randomly determined direction.
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