Select the incorrect statement from the following.

Options

A. Cytoskeleton are filamentous proteinaceous structure
B. Cytoskeleton provides mechanical support to the cell.
C. Cytoskeleton helps in motility and maintenance of shape of cell
D. Cytoskeleton also occurs in prokaryotic cell.

Answer

To solve the question, we need to analyze each statement provided and determine which one is incorrect regarding the cytoskeleton.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- **Statement**: "Cytoskeleton is a filamentous proteinaceous structure."
- **Evaluation**: This statement is correct. The cytoskeleton is indeed made up of protein filaments that provide structure and support to the cell.

2. **Analyze the Second Statement**:
- **Statement**: "Cytoskeleton provides mechanical support to the cell."
- **Evaluation**: This statement is also correct. The cytoskeleton plays a crucial role in maintaining the cell's shape and providing mechanical support.

3. **Analyze the Third Statement**:
- **Statement**: "Cytoskeleton helps in the motility and maintenance of the shape of the cell."
- **Evaluation**: This statement is correct as well. The cytoskeleton is involved in cellular movement (motility) and helps maintain the cell's shape.

4. **Analyze the Fourth Statement**:
- **Statement**: "Cytoskeleton also occurring in the prokaryotic cell."
- **Evaluation**: This statement is incorrect. The cytoskeleton is primarily found in eukaryotic cells. While prokaryotic cells have some protein structures that can be analogous to components of the cytoskeleton, they do not have a true cytoskeleton like eukaryotic cells.

### Conclusion:
The incorrect statement is: "Cytoskeleton also occurring in the prokaryotic cell."