Archaea and bacteria are prokaryotes that lack cell nuclei and membrane-bound organelles, while protists are eukaryotes that possess both of these features. Archaea and bacteria are always single celled, while a small number of protists are multicellular organisms.Continue Reading
Archaea and bacteria both store their DNA in rings called plasmids, and both are surrounded by cell walls. Protists store their DNA inside a defined cell nucleus. Some protist groups, such as algae, possess cell walls; other groups, such as the animal-like protozoa, do not have cell walls.
While all archaea and bacteria are single-celled organisms, some protists are multicellular organisms. Multicellular protists include kelp and other large brown algae species; all other species of protists are single celled. All three groups include varied species that obtain energy in diverse ways: through photosynthesis, through consuming chemicals and through consuming other organisms.
Most archaea consume chemicals, but some species can switch to photosynthesis when necessary. All species of algae obtain their energy via photosynthesis, but animal and fungus-like protists consume other organisms for food. Bacteria are represented in all three groups and have a more diverse range of habitats than archaea or protists. Archaea have the smallest habitat of the three groups, living in extreme environments that cannot support other life.Learn more about Biology
Some common features found in prokaryotes and eukaryotes are that they have cell plasma membranes, cytoplasm, DNA and ribosomes. Prokaryotes include organisms like bacteria and cynobacteria while algae, fungi and protozoans are types of eukaryotes. Although these different types of organisms have certain similarities, there are many more differences.Full Answer >
The distinction between prokaryotes and eukaryotes is the deepest division in the realm of life on Earth. Together, they include every life form ever discovered. Though the two groups share a common ancestry, there are basic differences between them. Eukaryotes have nucleated cells and identifiable cell structures called organelles, while prokaryotes are more variable in their cellular structure and lack a discrete nucleus, according to About.com.Full Answer >
In both eukaryotes and prokaryotes, glycolysis occurs in the cytoplasm of the cell. Glycolysis is the first step of cellular respiration, which has 10 steps in all.Full Answer >
Eubacteria are one of the two major groups of single cell organisms that lack nuclei and many other organelles found in eukaryotes. They have vast diversity, with a wide range of habitats and lifestyles, but all either have an elongated helical shape, a rod shape or a sphere shape.Full Answer >