There are two cell types, the prokaryotes and eukaryotes that contains information that will be discussed on this page.
Prokaryotes are cells without a nucleus. They have genetic material but they are not enclosed in a membrane. Prokaryotes include bacteria and cyanopytes. The genetic material is a single DNA strand and is contained in the cytoplasm, since there is no nucleus. This DNA works in just the same way as it does in other organisms but it is not gathered together into chromosomes visible through a microscope.
Eukaryotes are cells with a nucleus. They are found in humans and other multicellular organisms. They have both a cellular membrane and a nuclear membrane. Eukaryote's genetic material form multiple chromosomes. They are composed of both plant and animal cells. Plants vary from animal cells in that they do have vacuoles, cell wall, and chloroplast. They do not have lysosomes, centrioles, pseudopods, flagella, or cilia.
For more information on cell types visit <http://www.northern.wvnet.edu~tdanford/bioc4>