The structure found in plant and bacterial cells but not animal cells is a cell wall.

Here's why:

* Cell walls provide structural support and protection for the cell.

* Plant cell walls are made of cellulose, a complex carbohydrate.

* Bacterial cell walls are made of peptidoglycan, a unique molecule that is a target for some antibiotics.

* Animal cells lack a rigid cell wall and instead rely on a flexible cell membrane.

Let me know if you have any other questions about cell structures!