PROTISTA
The protists are usually single celled organisms. They have a distinct nucleus.
Protista
Other references
Marguilis, L., Corliss, J.O., Melkonian, M.,and Chapman, D.J. (Editors) 1990. Handbook of Protoctista. Jones and Bartlett , Boston. ISBN 0-86720-052-9 ...
Protista The taxonomic Kingdom from which the other three eukaryotic kingdoms (Fungi, Animalia and Plantae) are thought to have evolved.
Protista
The most ancient eukaryotic kingdom, protists include a variety of eukaryotic body (single-celled-colonial-multicellular?) and nutritional heterotrophic, autotrophic, and both) forms.
Protista The kingdom whose members are characterized by being eukaryotic and unicellular or colonial.
proto-oncogene. See oncogene.
protocoel The anterior coelomic compartment in some deuterostomes, corresponds to the axocoel in echinoderms.
The Protista Kingdom consists of unicellular life forms (life forms with only one cell) who have a nucleus. The primary difference between protists and monerans is that protists are more complex, having a nucleus.
The kingdom Protista as it now stands includes the unicellular and a few simple multicellular eukaryotic organisms with no well defined tissues or organs.
Radiolaria. Protistan phylum, whose members are planktonic and secrete an often elaborate siliceous test
Radula. A belt of teeth, found in gastropods and chitons. Used for feeding.
also : kingdom protista -(Science: biology) The kingdom of eukaryotic unicellular organisms. It includes the protozoa, unicellular eukaryotic algae and some special forms of fungi (myxomycetes, acrasiales and oomycetes).
The name Protista means "the very first", and some of the 80-odd groups of organisms that we classify as protists may well have had long, independent evolutionary histories stretching as far back as 2 billion years.
In 1969 Whittaker proposed a "five kingdom" system in which three kingdoms were added to the animals and plants: Monera (bacteria), Protista, and Fungi. Whittaker defined the kingdoms by a number of special characteristics.
Apicomplexa Division of Protista which includes many parasites such as Plasmodium vivax which causes malaria
(api = bee or apic = apex‚ summit‚ tip) ...
- the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP.
Pigeonpea ...
They are usually treated as a kingdom Protista or Protoctista, first introduced by Haeckel. The protists are a paraphyletic grade, and aside from a relatively simple organization, there are not many characteristics common to the group.
They belong to the Kingdom Protista and include the multicellular red (rhodophyte), green and brown (kelp) algae. They are not plants but all land plants evolved from the green algae (see also Chromista).
Hierarchy of life ˇ¤ Origin of life ˇ¤ Life on Earth ˇ¤ Eukaryota (Plants/Flora, Animals/Fauna, Fungi, Protista) ˇ¤ Prokaryote (Archaea, Bacteria) ˇ¤ Virus ˇ¤ Evolutionary history of life ˇ¤ Biology
Category ˇ¤ Portal ...
Within prokaryotes, which appeared 3.5 billion years ago, are the kingdoms Monera (Eubacteria) and Archaea. Within eukaryotes, which evolved 1.5 billion years ago, are the kingdoms Protista, Plantae, Fungae, Animalia.
 See also: Protist, Organ, Plant, Animal, Animals
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