No, a nucleolus is not found in bacteria cells.

Here's why:

* Bacteria are prokaryotes: This means they lack a true nucleus and other membrane-bound organelles.

* The nucleolus is a structure within the nucleus: It is responsible for ribosome biogenesis. Since bacteria don't have a nucleus, they also don't have a nucleolus.

* Bacteria have ribosomes: While bacteria lack a nucleolus, they still have ribosomes. These are smaller and slightly different than eukaryotic ribosomes, but they are crucial for protein synthesis.

Let me know if you have any other questions!