Prokaryotic cell DNA is a single molecule, found free in the cytoplasm; additional DNA is found on one or more rings called plasmids.

In eukaryotic cells, the membrane that surrounds the nucleus ... which is located in the cytoplasm. Tiny pores in the nuclear envelope, called nuclear pores, then selectively permit certain ...

The nuclear pore is a protein-lined channel in the nuclear envelope that regulates the transportation of molecules between the nucleus and the cytoplasm. In eukaryotic cells, the nucleus is ...