Which structure is found in the cytoplasm of a prokaryotic cell, but is not found in the cytoplasm of a eukaryotic cell?

DNA.

Explanation:

Cells are classified into prokaryotes and eukaryotes. Prokaryotes arose long before eukaryotes. There are prokaryote fossil dating three billion years old. The eukaryotes probably appeared a billion years ago.

Prokaryotes are cells that do not have a nuclear envelope delimiting the genetic material, then their DNA is found in the cytoplasm of the cell. They also do not have membranous organelles and cytoskeleton, so there is no transport of vesicles involved in the entry (endocytosis) and exit (exocytosis) of substances. This is the case of bacteria and blue algae.

Eukaryotic cells have a nuclear envelope, forming a true nucleus, which protects DNA from cytoskeleton movement. The eukaryote cytoplasm, unlike that of prokaryotes, is subdivided into compartments, increasing metabolic efficiency, which allows them to reach larger size without compromising their functions. These cells are found in protozoa, fungi, plants, and animals.