Question

a swimming bacterium reorients during a ______.

○ run
○ tumble

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Explanation:

Bacteria use a run - tumble mechanism for movement. During a "run", the bacterium moves in a straight line with flagella rotating in a coordinated way. During a "tumble", the flagella rotate in a disordered manner, which causes the bacterium to reorient itself randomly. So a swimming bacterium reorients during a tumble.

Answer:

B. tumble