1. Plasma Membrane: Both types of cells have a plasma membrane that encloses the cell, regulating what enters and exits. This membrane is composed of a phospholipid bilayer.

2. Genetic Material (DNA): Both eukaryotes and prokaryotes store their genetic information in DNA. While eukaryotic DNA is housed within a nucleus, prokaryotic DNA is found in a region called the nucleoid.

3. Ribosomes: Both types of cells have ribosomes, the cellular machinery responsible for protein synthesis. While ribosomes are slightly different in structure between the two types, they perform the same basic function.

4. Cytoplasm: Both eukaryotes and prokaryotes have cytoplasm, the gel-like substance that fills the cell and contains the cell's internal components.

Let me know if you would like to learn more about the differences between eukaryotic and prokaryotic cells!