Question

prokaryotic and eukaryotic cells have all of the following structures in common except:
○ ribosomes
○ cytoplasm
○ nucleus
○ a plasma membrane

Explanation:

To solve this, we recall the structural differences between prokaryotic and eukaryotic cells. Prokaryotic cells (e.g., bacteria) lack a membrane - bound nucleus, while eukaryotic cells (e.g., plant, animal cells) have a nucleus. Both have ribosomes (for protein synthesis), cytoplasm (the fluid - like substance inside the cell), and a plasma membrane (to enclose the cell). So the structure that is not common is the nucleus.

Answer:

C. nucleus