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.

Prokaryotes are divided into two distinct groups: the bacteria and the archaea ... organisms that have a relatively simple structure. Prokaryotic cells are surrounded by a plasma membrane ...

Planctomycetes challenge our concept of the bacterial cell and of a prokaryote as ... Phylogenetic structure of the prokaryotic domain: the primary kingdoms. Proc Natl Acad Sci U S A 74, 5088 ...

Though more primitive than eukaryotes, prokaryotic bacteria ... all cells maintain internal homeostasis, or stability.