Advanced Placement (AP) Biology Practice Exam 2025 – Comprehensive All-in-One Resource for Exam Success!

The primary cell junction found in plant cells is called plasmodesmata. These structures are specialized channels that traverse the cell walls, allowing for direct communication and transport of materials between adjacent plant cells. Plasmodesmata facilitate the movement of water, nutrients, and signaling molecules, which is crucial for the overall function and coordination of plant tissues.

In contrast, desmosomes are found in animal cells and provide structural support by linking adjacent cells together, while gap junctions are also found in animal cells and allow for the transfer of ions and small molecules between cells. Tight junctions create a barrier that prevents the leakage of substances between epithelial cells, but they do not serve the same communication role as plasmodesmata in plant cells. The unique structure and function of plasmodesmata make them essential for the interconnectedness seen in plant cell function.