Discussion
The principal distinction between a prokaryotic and a eukaryotic cell is that a eukaryote has
Answer: C
Correct answer: a nucleus bounded by a membrane
The membrane-bound nucleus is the defining difference and the one the names record - karyon is Greek for kernel. Both cell types have a plasma membrane and ribosomes, and cell walls occur in both groups, so none of those separates them. The nuclear envelope brings a wider consequence with it: transcription and translation are separated in space, which is what allows the RNA processing eukaryotes depend on.
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