Bacteriology Resources pertaining to bacteria. Biology Forum Discuss and debate issues concerning biology. Life is both wonderful and majestic. Yet for all of its majesty, all organisms are composed of the fundamental unit of life, the cell. Let's look at some of the components of this basic organizer of living organisms.
Prokaryotic cells have no true nucleus while eukaryotic cells have a true nucleus.
Only bacteria and cyanobacteria are prokaryotes. Animals, plants, fungi and protists are eukaryotes. Eukaryotic and prokaryotic cells also differ in size. On average, prokaryotic cells are about 10 times smaller in diameter than eukaryotic cells.