Bacteria are amongst the simplest of organisms - they are made of single cells. Their cell structure is simpler than the cells of animals, plants and fungi.
Cells of animals, plants and fungi are called eukaryotic cells.
Cells of bacteria are called prokaryotic cells.
The two types of cell compared:
|Feature||Eukaryotic cell||Prokaryotic cell|
|Size||Most are 5 μm - 100 μm.||Most are 0.2 μm - 2.0 μm.|
|Outer layers of cell||Cell membrane, surrounded by cell wall in plants and fungi.||Cell membrane, surrounded by cell wall.|
|Cell contents||Cytoplasm, cell organelles include mitochondria, ribosomes and chloroplasts in plants.||Cytoplasm, ribosomes present; there are no mitochondria or chloroplasts.|
|Genetic material||DNA in a nucleus, plasmids are found in a few simple eukaryotic organisms.||DNA is a single molecule, found free in the cytoplasm; additional DNA is found on one or more rings called plasmids.|
A group of organisms called Archaea are also prokaryotic.