Which of the following is not an organelle that prokaryotic and eukaryotic cells share?

• A. Ribosome
• B. Nucleus
• C. Plasma membrane
• D. Cytoplasm

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definition of organelles and the difference between prokaryotic and eukaryotic cells. Organelles are specialized structures within cells that perform distinct functions.
2. Step 2: Identify organelles common to both prokaryotic and eukaryotic cells. Ribosomes, plasma membrane, and cytoplasm are found in both cell types.
3. Step 3: Recognize that the nucleus is a membrane-bound organelle that contains genetic material and is present only in eukaryotic cells, not in prokaryotic cells.
4. Step 4: Compare each option to determine which organelle is exclusive to eukaryotic cells. Since ribosomes, plasma membrane, and cytoplasm are shared, the nucleus is the one not shared.
5. Step 5: Conclude that the nucleus is the organelle not shared by prokaryotic and eukaryotic cells.