Which of the following is not a connection between the plasma membrane of adjacent cells ?

Options

A. Desmosomes
B. Tight junction
C. Gap junctions
D. Transverse junction

Answer

To solve the question "Which of the following is not a connection between the plasma membrane of adjacent cells?", we will analyze the options typically provided in such questions. The common types of cell junctions include desmosomes, tight junctions, gap junctions, and others.

### Step-by-Step Solution:

1. **Identify the Types of Cell Junctions**:
- **Desmosomes**: These are specialized structures that provide strong adhesion between adjacent cells. They connect the plasma membranes of neighboring cells, allowing them to resist mechanical stress.
- **Tight Junctions**: These junctions create a watertight seal between adjacent cells, preventing the passage of molecules and ions through the space between cells. They are crucial in maintaining the integrity of epithelial layers.
- **Gap Junctions**: These are channels that allow for communication between adjacent cells. They enable the transfer of ions, nutrients, and other small molecules, facilitating intercellular communication.

2. **Evaluate Each Option**:
- **Desmosomes**: As mentioned, they connect adjacent plasma membranes, so this is a connection.
- **Tight Junctions**: They also connect adjacent plasma membranes by forming a seal, so this is a connection.
- **Gap Junctions**: These allow communication between cells but also connect adjacent cells through channels, so this is a connection as well.

3. **Identify the Incorrect Option**:
- If the question includes an option that is not a type of junction connecting the plasma membranes of adjacent cells, such as "plasmodesmata" (which are connections in plant cells and not in animal cells), that would be the correct answer to the question.
- Alternatively, if the options include something unrelated to cell junctions, that would also be the answer.

4. **Conclusion**:
- After evaluating the common types of cell junctions, the answer to the question is the option that does not represent a connection between the plasma membranes of adjacent cells.

### Final Answer:
The correct answer is the option that is not a recognized type of junction connecting the plasma membranes of adjacent cells (e.g., "plasmodesmata" if listed).