Question

which structure is unique to eukaryotic cells?
dna
cell membrane
ribosomes
nucleus

Explanation:

DNA is present in both prokaryotic and eukaryotic cells. Cell membranes are a feature of all cells. Ribosomes are also found in both prokaryotes and eukaryotes. However, the nucleus is a membrane - bound organelle that is unique to eukaryotic cells. Prokaryotic cells do not have a true nucleus.

Answer:

nucleus