Explain key differences between prokaryotic and eukaryotic cells.

The student should give an answer that reflects that eukaryotic cells evolved later and have had lots of time to become different through evolution, for instance: “prokaryotic and eukaryotic cells have many differences in terms of appearance and organisation of structures within the cell (I). In general, eukaryotic cells are more complex (I). Eukaryotic cells are generally larger (I), have a well-defined nucleus surrounding the DNA (I). Prokaryotes usually have cell walls, whereas eukaryotic cells often do not (I). Eukaryotic cells have several other organelles absent in prokaryotic cells: for instance, endoplasmic reticulum (I), mitochondria (I), Golgi bodies (I), and lysosomes (I).  In prokaryotic cells, organelles are not membrane-bound (I) and the DNA is not organized by histones (I). However, prokaryotes often have DNA plasmids and eukaryotes generally do not (I). Finally, in prokaryotes, translation of proteins is not associated with endoplasmic reticulum (I). 

There are many further correct answers.