Which of the following cellular junctions is incorrectly matched with its description? a) Middle lamella – binds adjacent animal cells together b) Plasmodesmata – openings between plant cells that allow communication c) Tight junctions – adhering junctions that prevents the passage of materials between cells d) Gap junctions – openings between animal cells that allow communication
The Correct Answer and Explanation is:1
The incorrect match is a) Middle lamella – binds adjacent animal cells together.
Explanation:
- Middle lamella: The middle lamella is a structure found in plant cells, not animal cells. It is a layer of pectin (a type of carbohydrate) that helps bind adjacent plant cells together, providing structural support. The middle lamella is located between the primary cell walls of adjacent plant cells and plays a critical role in cell adhesion, but it is not present in animal cells.
- Plasmodesmata: Plasmodesmata are channels found in plant cells that allow communication and the exchange of materials between neighboring plant cells. They pass through the cell wall and connect the cytoplasm of adjacent cells. This description is correct.
- Tight junctions: Tight junctions are specialized connections between animal cells that seal the space between adjacent cells, preventing the passage of molecules and ions between them. These junctions are essential for maintaining selective permeability in tissues, such as the lining of the intestines, and are correctly described in the option.
- Gap junctions: Gap junctions are channels that exist between animal cells, facilitating communication by allowing small molecules and ions to pass between cells. This enables coordinated cell activity in tissues like muscle and nerve cells. The description of gap junctions is also correct.
Thus, the correct answer is a) because the middle lamella is not found in animal cells, but is specific to plant cells.
