Almost every organism you can see without a microscope -- and some microscopic organisms as well -- are examples of eukaryotes. Eukaryotes have many cellular characteristics that distinguish them from prokaryotes like bacteria. For example, all eukaryotes have complex organelles, including a cytoskeleton, a membrane-bound nucleus and other membrane-bound organelles like mitochondria, the Golgi apparatus and chloroplasts. They also have relatively large cells, generally much larger than bacterial cells. All protists, fungi, plants and animals are examples of eukaryotes.