Eukaryotic organisms are characterized by the presence of a membrane-bound cell nucleus and contain additional membrane-bound compartments called organelles (such as mitochondria in animals and plants and plastids in plants and algae, all generally considered to be derived from endosymbiotic bacteria). Prokaryotes are represented by two separate domains – bacteria and archaea. Beetles, squids, tetrapods, mushrooms, and vascular plants are examples of multicellular organisms that differentiate specialized tissues and organs during development.Ī unicellular organism may be either a prokaryote or a eukaryote. All types of organisms are capable of reproduction, growth and development, maintenance, and some degree of response to stimuli. Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi or unicellular microorganisms such as protists, bacteria, and archaea. All organisms are composed of cells ( cell theory). In biology, an organism (from Ancient Greek ὄργανον (órganon) 'instrument, implement, tool', and -ισμός (-ismós)) is any organic, living system that functions as an individual entity. Polypore fungi and angiosperm trees are large many-celled eukaryotes.
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