A flagellum is composed of

Options

A. Inclusion bodies, filament and hook
B. Filament, hook and basal body
C. Filament, cell wall and cell membrane
D. Filament, mesosomes and basal body

Answer

To answer the question about the composition of a flagellum, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Flagellum**: A flagellum is a long, whip-like structure that enables movement in certain cells, particularly in bacteria. It is an outgrowth from the bacterial body.

2. **Identifying the Parts of the Flagellum**: The flagellum is composed of three main parts:
- **Basal Body**: This is the part that anchors the flagellum to the cell membrane and cell wall. It acts as a motor that drives the rotation of the flagellum.
- **Hook**: This is a curved structure that connects the basal body to the filament. It acts as a flexible coupling that allows the filament to rotate.
- **Filament**: This is the long, whip-like structure that extends from the hook. It is responsible for the actual movement of the cell through a rotating motion.

3. **Conclusion**: Therefore, the correct composition of a flagellum includes the basal body, hook, and filament.

### Final Answer:
A flagellum is composed of three parts: the basal body, hook, and filament.

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