The bacterial ﬂagellum has three components. In order from the cytoplasm to the external environment, they are ______.

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The bacterial flagellum is structured in a specific order from the cytoplasm to the external environment: the basal body is anchored in the cytoplasmic membrane and acts as the motor, the hook is a curved segment that connects the basal body to the filament, and the filament is the long, whip-like structure that protrudes outside the cell and is responsible for motility.

The Bacterial ﬂAgellum Has Three Components