Which cellular structure is present in eukaryotic cells but absent in prokaryotic cells?

• A. Cytoplasm
• B. Cell membrane
• C. Ribosomes
• D. Nucleus

Answer: (D)

Verified step by step guidance

1. Understand the basic differences between eukaryotic and prokaryotic cells. Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.
2. Identify the cellular structures listed in the problem: cytoplasm, cell membrane, ribosomes, and nucleus.
3. Recognize that cytoplasm, cell membrane, and ribosomes are present in both eukaryotic and prokaryotic cells.
4. Learn that the nucleus is a membrane-bound organelle that houses the cell's genetic material and is a defining feature of eukaryotic cells.
5. Conclude that the nucleus is the cellular structure present in eukaryotic cells but absent in prokaryotic cells.