By comparing eukaryotic and prokaryotic cell it can be demonstrated that there are many fundamental difference among eukaryotic and prokaryotic cells. the biggest one is the presence of membrane bound nucleus in eukaryotic cells. however, there is no such membrane bound organelles present in procaryotes.
On the bases of this many cells those are defined as ancient cells, can be differentiated and grouped as prokaryotes and eukaryotic cells. most prokaryotic cells are smaller then eukaryotic cells. there are prokaryotic cells those are even have a similar size as of mitochondria and chloroplasts in eukaryotic cells.
The presence of nucleus in eukaryotic cells is the most obvious difference between these two cell types, but many other major distinctions also exist.
Prokaryotic cells are simpler functionally in several ways. They lack mitosis and meiosis, and have a simpler genetic organization. Many complex eukaryotic processes are absent in procaryotes: endocytosis, intracellular diagnostic, direct cytoplasmic streaming and ameboid movement, are just a few.
Despite the many significant differences between these two basic cell forms, they are remarkably similar on the biochemical level. Prokaryotes and eukaryotes are composed of similar chemical constituents. With a few exceptions, the genetic code is the same in both, as is the way in which the genetic information in DNA is expresses. The principles underlying metabolic processes and many important metabolic pathways are identical.