What is the unique feature found in some eukaryotic cells that is absent in prokaryotic cells?
Final Answer: Eukaryotic cells are unique in having a true nucleus that isolates and protects their genetic information, a feature absent in prokaryotic cells.
Explanation
The feature that is unique to some eukaryotic cells and never seen in prokaryotic cells is the presence of a nucleus where the genetic information is stored. In eukaryotic cells, genetic information is produced, replicated, and stored within the nucleus. The nuclear envelope isolates and protects a eukaryotic cell's DNA from various molecules that could accidentally damage its structure or interfere with its processing. In contrast, the genetic information in prokaryotic cells is contained within a region called the nucleoid, which is not a true nucleus as it is not separated from the rest of the cell by a nuclear envelope.