What are distingushing charatericstics of protozoans?
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Protozoans are members of Kingdom Protista which exhibit animal-like characteristics. For instance protozoans are heterotrophs, which means they are unable to produce their own food, and they are all typically mobile using cilia, flagella, or pseudopodia. Of course, the main reason we are so interested in protozoans is because so many of them cause diseases in humans, especially in tropical environments.
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Protozoa are microscopic organisms, bigger than Bacteria, they have evolved and they get food from eating Bacteria.\nWhen they get big enough they split into two exact copies and thereby reproduce and grow.
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There are only a handful becasue more antibiotics attack prokaryotic cellular structures, such as the prokaryotic ribosome, but protozoa are eukaryotic. Examples that are used inlcudeamphotericin B, metronidazole, pentamidine and tinidazole
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id say the plants and animals are multi-celled and the others are single-celled. also cell specilization could be a difference.
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GENUS: Amoeba\n\nSPECIES: Amoeba proteus\n\nCOMMON NAME: Ameba\n\nImage: \nhttp://en.wikipedia.org/wiki/Image:Chaos_diffluens.jpg
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It is theoretically possible, although unlikely. If the organism (protozoa) can live exposed to the air for very long it is possible. It would most likely have to be immediate transfer; within a few seconds.
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These are single-celled (unicellular) organisms, and\nhave a well-defined membrane-bound nucleus.\nTheir modes of nutrition may be quite varied.\n• Active feeders: Some protists like Amoeba and\nParamecium (Fig. 23.5) ingest food like most\nanimals. Very often these are also referred to as\nProtozoa (protos: primitive, zoon: animal).\n• Photosynthesizers: Some protists like Euglena\n(Fig. 23.3) have chlorophyll and manufacture\ntheir own food like the plants.\n• Reproduction: Mostly asexual reproduction by\nfission and some reproduce sexually.\n• Occurrence: Many protists live freely in water\nor in soil and many are harmful parasites which\ncause diseases. Some of the protists are\npathogenic, such as Entamoeba histolytica that\ncauses dysentery and Plasmodium vivax that\ncauses malaria.
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Eukaryotes have organelles and are comparmentalized.  Prokaryotes do not have organelles and are not compartmentalized.
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Toxoplasma Gondii\n\nhere check out this site....\n\nhttp://www.innvista.com/HEALTH/MICROBES/protozoa/toxoplas.htm
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"No protists are producers."\n\nI'm sure of it. Protists are the "junk drawer" of kingdoms.\nThe category of Protists includes many widely ranging microbes, including slime molds, protozoa and primitive algae. They are all eukaryotic <you-carry-ah-tick> creatures, meaning their DNA is enclosed in a nucleus inside the cell (unlike bacteria, which are prokaryotic <pro-carry-ah-tick> and have no nucleus to enclose their DNA. \n\nAlgae, Protozoa, Slime molds: Some produce and some consume.
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look here:\n\nhttp://www.biologie.uni-hamburg.de/b-online/e18/18c.htm
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Bacteria, amoebas and fungi
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Protozoans are single-celled organisms such as amoeba, euglena, vorticella and others, characterized by possession of a true nucleus in the cell.\n\nBacteria do not have a nucleus.  They are usually placed in the Kingdom Monera. \n\nSpecialists in single-celled organisms have found that the standard system of five kingdoms doesn't fit well with the vast diversity seen in single-celled organisms.  They use as many as 30 or 40 Kingdoms to classify all these critters.  Most of us don't care enough about single-celled critters to bother to learn the bajillions of different varieties.
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lower level animals IE protozoans, flagellates
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Which parasite?\nBacterial, viral, protozoa etc = no\nLeech, insect, helminth etc = sort of \nCuckoo, vampire bat etc = yes\n\nI think there are parasites in every phyla.
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http://dev.biologists.org/cgi/content/full/130/17/4123?ck=nck
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The amoeba "Entamoeba Histalytica" causes amoebic disentery.