Question

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

Explanation:

• DNA: Both prokaryotic and eukaryotic cells have DNA.
• Cell membrane: Both cell types have a cell membrane.
• Ribosomes: Both have ribosomes (though prokaryotic ribosomes are smaller).
• Nucleus: Eukaryotic cells have a membrane - bound nucleus, while prokaryotic cells do not have a nucleus (their genetic material is in the nucleoid region). So the nucleus is unique to eukaryotic cells.

Answer:

D. nucleus (assuming the options are labeled A - D as: A. DNA, B. cell membrane, C. ribosomes, D. nucleus)