an organism with "good" or membrane-bound nuclei having multiple chromosomes; eucaryotes also have other membrane-bound organelles such as mitochondria or chloroplasts, within the cytoplasm enclosed by the outer membrane. Such cells are characteristic of all life forms except primitive microorganisms such as bacteria and blue-green algae. Contrasted with prokaryote.
Organism that contains a defined nucleus; includes all organisms except viruses, bacteria and blue-green algae, which are known as prokaryotes.
(Also eukaryote.) Living organism composed of one or more cells with a distinct nucleus and cytoplasm. Includes plans, animals, fungi and protozoa; excludes bacteria (prokaryotes).