Eukaryotic cells
Eukaryotic cells all have a cell membrane, cytoplasm, and genetic material that is enclosed in a nucleus. The genetic material is a chemical called DNA, forming structures called chromosomes that are contained within a nucleus. All animals, plants, fungi and protista are eukaryotes.
Prokaryotes
Bacteria are single celled organisms that are examples of prokaryotic cells. At 0.2-2 micrometres, prokaryotes are much smaller than eukaryotes. Bacteria have a cytoplasm and cell membrane as well as a cell wall, but this is not made up of cellulose like most plant cells. In prokaryotic cells, the genetic material is not enclosed in a nucleus but rather the bacterial chromosome is a single loop of DNA found free in the cytoplasm. They may also contain small rings of DNA called plasmids. These code for specific features such as antibiotic resistance.
Some bacteria may have a protective slime capsule around the outside of the cell wall. Some types of bacteria may also have at least one flagellum which is a strand of protein that lashes around for movement.
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