I've gone completely loony and posted my Biology homework on my xanga! Feel free to say: I do not understand (or a ruder version) Yawn* I already knew all of this. What? Wow, you are really smart! Wow, you are a nerd! You are paying for my brain surgery! Enjoy  Comparison between the structure of a Prokaryote and a Eukaryote. In the biological world, Prokaryote and Eukaryote are the two empires of the living world, that is, they comprise of every living organism that comprises of cells. A Prokaryote is free of all membrane-bound organelles. Simply put, a Prokaryote cell has no nucleus to speak of. On the other hand, the Eukaryote means all living organisms with complex cells or cell. In fact, Prokaryote and Eukaryote are the two empires of cellular life, so Prokaryote and Eukaryote, together, comprises of every single living thing that has cells in it (viruses not included). Bacteria and Archaea was part of the Prokaryote empire, and all other living organisms (animals, plants, fungi etc) are part of the Eukaryote empire. Below is a diagram of a Prokaryote cell and below that is the Eukaryote cell:
When placed side-by-side, an animal cell is clearly more complex than a Prokaryote cell, however, this is only an animal cell, while the Eukaryote Empire encompasses all living organisms with nuclei, so the comparison between the two diagrams is not accurate for every species. However, the basic comparison is available from the two pictures; the most noticeable one of course is the nucleus in the animal cell, and the amount of membrane-bound dditives?in the animal cell, like mitochondrion, lysosome , peroxisome etc. These are all membrane-bound organelles, which protect and help the Eukaryote cell to a certain extent. A Prokaryote cell, however, has a cell wall, with traces of peptidoglycan, differing from plant and fungi cells, since their cell walls are made of chitin or cellulose. While it is true that a Prokaryote cell does not have any membrane-bound organelles, it does have a plasma membrane, with similar functions to an animal cell membrane. Also, just because a Prokaryote cell doesn have any membrane-bound organelles, does not mean it cannot have them floating inside the cell. A Prokaryote cell has ribosomes (which assemble proteins) floating around in the cytoplasm; an animal cell has the ribosomes too, but membrane-bound. One of the most obvious (from the human eye) similarities between a Prokaryote and an Eukaryote cell is the flagellum, however, the two are totally different in structure and how they move. The Prokaryote flagella crews?round and round, propelling the cell forward like a submarine, while a Eukaryote cell flagella would hip?the tail around and move. While the Prokaryote and the Eukaryote are the two empires of all living life, they have differences from each other, from the nucleus of a Eukaryote cell to the smallest detail that scientists have yet to discover, and of course, the most major thing to remember about these cells is that viruses are not living, so they cannot be classified in these two cells. | 
