Final answer:
All cells have a plasma membrane, ribosomes, cytoplasm, and DNA.
Step-by-step explanation:
Both prokaryotic and eukaryotic cells have structures in common. All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. The plasma membrane, or cell membrane, is the phospholipid layer that surrounds the cell and protects it from the outside environment. Ribosomes are the non-membrane bound organelles where proteins are made. The cytoplasm is all the contents of the cell inside the cell membrane, not including the nucleus.