Achaea exhibit a great variety of chemical
reactions in their metabolism and use many
sources of energy.
These reactions are classified into
nutritional groups, depending on energy and
Some archaic obtain energy from inorganic
compounds such as sulfur or ammonia.
These include nitrifies, methanogen and
anaerobic methane oxidisers.
Achaea that grow in hot water gave Morning
Glory Hot Spring in Yellowstone National Park a
Archaea reproduce asexually by binary or
multiple fission, fragmentation, or budding;
meiosis does not occur, so if a species of
archaea exists in more than one form, all
have the same genetic material.
Cell division is controlled in a cell cycle;
after the cell's chromosome is replicated and
the two daughter chromosomes separate, the
Both bacteria and eukaryotes, but not
archaea, make spores.
Some species of Haloarchaea undergo
phenotypic switching and grow as several
different cell types, including thick-walled
structures that are resistant to osmotic shock
and allow the archaea to survive in water at low
salt concentrations, but these are not
reproductive structures and may instead help
them reach new habitats.