The proteinaceous central part of the proximal region of the centriole is

Options

A. Spoke
B. Tubulin
C. Hub
D. Axoneme

Answer

To answer the question "The proteinaceous central part of the proximal region of the centriole is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Centrioles**:
- Centrioles are cylindrical structures found within the centrosome of a cell. They are typically arranged in pairs and are involved in cell division and the formation of cilia and flagella.

2. **Identify the Components of the Centriole**:
- Each centriole is composed of microtubules arranged in a specific pattern. They have a characteristic structure that resembles a cartwheel, consisting of nine peripheral triplet microtubules.

3. **Focus on the Proximal Region**:
- The proximal region of the centriole refers to the part closest to the centrosome. In this region, there is a central structure that plays a crucial role in the organization of the microtubules.

4. **Determine the Correct Term**:
- The central part of the proximal region of the centriole is known as the "hub." This hub connects to the peripheral triplets via radial spokes, which are also made of protein.

5. **Evaluate the Options**:
- The options provided are: Spoke, Tubulin, Hub, and Axoneme.
- **Spoke**: Connects the hub to the peripheral triplets (incorrect).
- **Tubulin**: A protein that makes up the microtubules (incorrect).
- **Hub**: The central part of the proximal region (correct).
- **Axoneme**: Refers to the structural core of cilia and flagella (incorrect).

6. **Conclude the Answer**:
- Based on the analysis, the correct answer is "Hub."

### Final Answer:
The proteinaceous central part of the proximal region of the centriole is **Hub**.

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