The cell is the basic functioning unit of organisms in which chemical reactions take place. These reactions involve an energy release needed to support life and build structures. The cell consists of membrane bound organelles, which are responsible for the division of labour. There are two main classes of cells- Prokaryotes which are cells without a nucleus, where the DNA is spread around the cytoplasm of the cell, an example of a prokaryote is a …showed first 75 words of 749 total…

…showed last 75 words of 749 total…Prokaryotes (without a nucleus) and Eukaryotes (with a nucleus). While they have many similarities, there are also many differences to their structures. It is likely that eukaryotes evolved from two prokaryotes at around the stage in the earth's history when oxygen became available. However, one thing for sure is that cells are found in all living organisms- be they single celled amoeba, to multi cellular humans. The Cell is therefore the basic unit of life.