Open Question
Name and describe three types of bacteria mentioned in this chapter that “glide.”
7. Prokaryotic Cell Structures & Functions
Prokaryotic Flagellar Movement
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A bacteria can rotate its flagellum clockwise or counterclockwise. If the bacterial cell wants to stop swimming, which direction will it rotate its flagellum?
A
Clockwise.
B
Counterclockwise.
C
To stop moving the bacterium will not rotate its flagellum at all.
Verified step by step guidance1
Understand the function of bacterial flagella: Flagella are tail-like structures that enable bacteria to move. They rotate either clockwise or counterclockwise to propel the bacterium through its environment.
Learn about the rotation mechanism: When flagella rotate counterclockwise, they bundle together and push the bacterium forward in a smooth swimming motion. This is known as 'run'.
Explore the effect of clockwise rotation: When flagella rotate clockwise, they cause the flagella to fly apart, leading to a 'tumble'. This changes the direction of the bacterium but does not necessarily stop movement.
Consider the scenario of stopping movement: To stop swimming, the bacterium would need to cease the rotation of its flagella entirely, as both clockwise and counterclockwise rotations result in movement.
Conclude the understanding: Recognize that stopping movement involves not rotating the flagella at all, as rotation in either direction results in some form of movement or change in direction.
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