Nucleus
Paramecium
(Eukaryotic Cell)
Bacteria
(Prokaryotic Cell)
Photo courtesy of Janice Haney
Carr, CDC
All organisms are made of either eukaryotic cells, like a Paramecium, or prokaryotic cells, like bacteria.
• Eukaryotic cells are generally larger, more complex, and contain organelles like the nucleus.
Click on the organism with a eukaryotic cell type.