Eukaryotic and Prokaryotic Cells
Here's where things get interesting - not all cells are built the same way! Eukaryotic cells (like animals, plants, fungi, and protists) have their genetic material neatly packaged inside a nucleus, whilst prokaryotic cells (like bacteria) have their DNA floating freely in the cytoplasm.
Bacterial cells are much simpler than the cells in your body. They still have a cell membrane, cytoplasm, and genetic material, but their DNA exists as a single loop rather than being contained in a nucleus. Many bacteria also have a cell wall, but it's not made of cellulose like plant cells.
Some bacteria have extra features that make them quite clever. They might have a flagellum (like a tiny tail) for swimming around, and small rings of DNA called plasmids that can carry useful genes. However, they lack the sophisticated organelles like mitochondria and chloroplasts that eukaryotic cells possess.
Remember: Prokaryotic = no nucleus pro=before,karyon=nucleus, Eukaryotic = true nucleus eu=true!