(pro kar´ ry otes) [L. pro: before + Gk. karyon: kernel, nucleus] • Organisms whose genetic material is not contained within a nucleus. The bacteria. Considered an earlier stage in the evolution of life than the eukaryotes.
Class of organisms, including the eubacteria and archaea, that lack a true membrane-limited nucleus and other organelles. See also eukaryotes.
organisms, namely bacteria and blue green algae, characterized by the lack of a distinct nucleus.
single-celled organisms — eg bacteria — that have no defined nucleus and whose genetic material is usually a circular duplex of DNA.
Organisms whose genetic material is not enclosed by a nucleus. The most common examples are bacteria.
Organisms that maintain their genome dispersed throughout the cytoplasm. (Not used in any formal taxonomic system, but previously used interchangeably with the term "bacteria.") More recently, one of three domains of life -- the Prokarya.
One of the three major evolutionary lineages of living organisms known as domains; characterised by a lack of nuclear membrane.
a cellular organism with no distinct nucleus
primitive cell type that lacks a nuclear membrane and membrane-bound organelles
the living things whose cells do not have nuclei; includes only single-celled bacteria.
single-celled organisms that are not compartmentalized by internal cellular membranes; includes the eubacteria and archaebacteria.
One of the two major groups of organisms on Earth (the other being Eukaryotes).They have no structured cell nucleus and no membrane-bounded organelles.
One-celled organisms (e.g., bacteria and blue-green algae) whose nuclear material consists of a single chromosome in the form of a circular DNA molecule and is not enclosed in a nuclear membrane. Prokaryotes usually have a rigid cell wall and lack internal organelles. Eukaryotes like yeast and humans have a lot of internal organelles.