Question

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

Explanation:

Both prokaryotic and eukaryotic cells have DNA, cell membranes, and ribosomes. However, only eukaryotic cells have a nucleus that houses their DNA. Prokaryotic cells have their DNA in the cytoplasm without a membrane - bound nucleus. So the nucleus is unique to eukaryotic cells.

Answer:

nucleus