How do you identify a eukaryote?

Eukaryotes can be identified by the presence of a defined nucleus that contains their genetic material, as well as membrane-bound organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus. They are typically larger than prokaryotic cells and can be unicellular or multicellular organisms. Additionally, eukaryotic cells often possess a cytoskeleton and can reproduce sexually or asexually. Common examples include animals, plants, fungi, and protists.