Tonofibrils are characteristic of which Junction :–

Options

A. Desmosomes
B. Plasmodesmata
C. Gap junction
D. Tight junction

Answer

**Step-by-Step Solution:**

1. **Understanding Tonofibrils**: Tonofibrils are specialized structures that are classified as intermediate filaments. They are important in providing structural support and are associated with certain types of cell junctions.

2. **Identifying Junction Types**: The question asks which type of junction is characterized by tonofibrils. The main types of cell junctions to consider are:
- Desmosomes
- Plasmodesmata
- Gap Junctions
- Tight Junctions

3. **Analyzing Each Option**:
- **Desmosomes**: These are intercellular junctions that provide strong adhesion between cells. They are known to be associated with tonofibrils, which help in anchoring the junctions to the cytoskeleton of the cells.
- **Plasmodesmata**: These are channels found in plant cells that facilitate communication and transport between cells. They do not involve tonofibrils.
- **Gap Junctions**: These are specialized connections that allow for the transfer of ions and small molecules between adjacent cells. They do not involve tonofibrils.
- **Tight Junctions**: These junctions prevent leakage of substances between cells and are not associated with tonofibrils.

4. **Conclusion**: Based on the analysis, the correct answer is **Desmosomes**, as they are the junctions that are characterized by the presence of tonofibrils.

**Final Answer**: Desmosomes

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