What kind of cells are classified as prokaryotic?

Prokaryotic cells are characterized by their simple structure and lack of a defined nucleus. They do not have membrane-bound organelles, which distinguishes them from eukaryotic cells, such as those found in animals, plants, and fungi. Bacterial cells fall under the category of prokaryotes because they possess these defining features. Their genetic material is not enclosed within a nucleus; instead, it is typically found in a single circular chromosome that floats freely in the cytoplasm.

In contrast, animal cells, plant cells, and fungal cells are all eukaryotic, meaning they contain a nucleus and various membrane-bound organelles, such as mitochondria and endoplasmic reticulum. This structural complexity allows for greater specialization and functioning within these organisms. Therefore, bacterial cells represent the only option that directly fits the definition of prokaryotic cells.