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There are two main cell types in nature, Prokaryotic and Eukaryotic. These cells types differ mainly by the fact that Prokaryotic cells have no nucleus while Eukaryotic cells do. Viruses, although they usually have a protein coat, are not considered cells.

Prokaryotic cells have a phospholipid membrane and no internal membranes. There are also differences in the DNA and ribosomes. There are two main types, Eubacteria and Archaebacteria. The Archaebacteria are quite different to the Eubacteria. They have a lipid membrane but it is usually a derivative of isoprenol. There are subunits in their ribosomes which also differ to all other bacteria. It has been suggested these two groups be separated into two distinct kingdoms.

Eukaryotic cells have a cell nucleus and other features such as mitochondria. In the Eukaryotes, the DNA is stored in the nucleus. Before protein synthesis the DNA pattern is first copied to precursurs for mRNA. Sections of RNA called introns are first removed using particles made partly of protein and partly of RNA. This is called cutting and splicing. From there it is passed on to the ribosomes in the cytoplasm for protein synthesis. This does not happen in the Prokaryotic cell.

Eukaryotic cells are then divided into several types depending on whether they are plants, animals, protists or fungi. Animals have only the mitochondria. Plants, on the other hand, have other organelles called plastids. These plastids all have the same DNA and membrane but exist in several forms such as chloroplasts responsible for photosynthesis and chromoplasts responsible for colour.

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