1. Humans: We are multicellular organisms with complex cells containing a nucleus and other membrane-bound organelles.

2. Mushrooms: These fungi are also eukaryotes. They have a unique cellular structure and obtain nutrients by absorbing organic matter.

3. Oak Trees: Plants are eukaryotes too. Trees like oak trees have specialized cells for photosynthesis and other vital functions.

4. Amoebas: These are single-celled organisms that are found in various environments. They move and feed using pseudopods (temporary extensions of the cell).

5. Yeast: These are single-celled fungi used in baking and brewing. They have a distinct nucleus and other internal structures.