Bacterial flagellum consists of all the following parts except :

Options

A. Filament
B. Microtubule
C. Hook
D. Basal body

Answer

To solve the question regarding the components of a bacterial flagellum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Bacterial Flagellum**:
- The bacterial flagellum is primarily composed of three main parts: the filament, the hook, and the basal body.

2. **Identify the Options**:
- The question asks which part is NOT a component of the bacterial flagellum. We need to analyze each option provided.

3. **Evaluate Each Option**:
- **Option 1: Filament** - This is a key part of the bacterial flagellum. Therefore, this option is incorrect as it is present.
- **Option 2: Microtubule** - This is not a component of the bacterial flagellum. Microtubules are found in eukaryotic cells, not in bacteria. This option is likely the correct answer.
- **Option 3: Hook** - The hook is indeed a part of the bacterial flagellum, connecting the filament to the basal body. Thus, this option is incorrect.
- **Option 4: Basal Body** - The basal body is the motor part of the flagellum that anchors it to the cell wall and membrane. This option is also incorrect.

4. **Conclusion**:
- After evaluating all options, the only part that is not present in the bacterial flagellum is **Microtubule** (Option 2).

### Final Answer:
The correct answer is **Microtubule**.

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