The structure found only in plant cells and not animal or bacteria cells is the cell wall.

Here's why:

* Cell Wall: This rigid outer layer provides structural support and protection for the plant cell. It's mainly composed of cellulose, a complex carbohydrate.

* Animal Cells: Animal cells lack a cell wall. They have a flexible cell membrane that allows for movement and shape changes.

* Bacteria Cells: While bacteria have a cell wall, it's made of peptidoglycan, a different material than the plant cell wall.

Let me know if you have any other questions!