what is the economic significance of protozoans?
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Your question is to wide... protozoans are too big a group to tell their economic importance as a whole. You'll first have to find each and everyone of the organisms of the protozoan taxa than causes any disease (e.g. Plasmodium - malaria), then find out if there are estimates of their economic importance... then make the math.\nNext, you'll need to find out which protozoans may contribute to any industrial process. Who knows, there may be some species that is used to produce something... (as Sacharomyces cereviceae is used to produce beer)\nNext, find out the economic importance of protozoans as cell models in scientifical experiments...\nNext, find out the economic importance of protozoans as a fundamental part of the trophic chain in the oceans, and what would happen to the fish inductry around the world if they were gone...\nSo your question may no have as yet an estimate
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B) Membrane-bound organelles\nThe procariotic cells are like a water-filled baloon, they are just a cover with water and other things (of course, this is only an example), while eukaryotic cells have compartiments.\nEvery cell has DNA, that's the way information is passed from cell to cell when they reproduce.\nRibosomes are important for producing proteins, every cell has to have them, even if with time they lose them.\nCytoplasm is the 75% of every cell, it's basically water, proteins and other things.
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Here are  the importances of mushrooms(Basidiomyces)\n\n1.Industrial use in production of chemicals\n2.Fioods\n3. Biodegradation\n4. Decomposition\n5. Agriculture
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a) their lack of hemoglobin -  this is only in red blood cells, it is a protein used to carry oxygen, has nothing to do with fighting infection.\nb) their high concentration of lysosomes - lysosomes are very important in fighting disease because they contain enzymes used to kill bacteria.\nc) their very large size in comparison to microbes - all eukaryotes are huge compared to bacteria, but not all diseases are caused by prokaryotes. worms and such are also attacked by white blood cells, and they are multicelllular.\nd) their natural synthesis of antibiotic-like substances - this is very important the production of antibodies signals the other white blood cells as to what kind of invader is in the system.\ne) their lack of plasma membrane - they do have a plasma membrane all cells do.
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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 good ones and bad ones\n\n\n\nProtists (IPA: [prəʊˌtɪst]) are a heterogeneous group of living things, comprising those eukaryotes that are neither animals, plants, nor fungi. They are usually treated as the kingdom Protista or Protoctista. The protists are a paraphyletic grade, rather than a natural (monophyletic) group, and do not have much in common besides a relatively simple organization (unicellular, or multicellular without highly specialized tissues). Some call it the "left-overs" kingdom. If an organism is eukaryotic, but does not fit in the plants, animals or fungi - then it is a protist.\n\nProtists were traditionally (for the last 150 years) subdivided into several groups based on similarities to the higher kingdoms: the animal-like protozoa and the plant-like algae and the fungi-like slime molds . These traditional groups often overlapped. A new working model for the taxonomy of the eukaryotic organisms has recently been codified by a collaborative team.(see references below.) In it the evolutionary relationships among the eukaryotes is given priority rather than method of obtaining energy or structural characteristics.\n\nThe protozoa are mostly single-celled, motile, and feed by phagocytosis, though there are numerous exceptions. They are usually only 0.01-0.5 mm in size, generally too small to be seen without a microscope. They are ubiquitous throughout aqueous environments and the soil, commonly surviving dry periods as cysts or spores, and include several important parasites. Based on locomotion, protozoa are grouped into:\n\nFlagellates with long flagella e.g., Euglena \nAmoeboids with transient pseudopodia e.g., Amoeba \nCiliates with multiple, short cilia e.g., Paramecium \nSporozoa non-motile parasites; form spores e.g., Plasmodium \n\nAlgae\nThe algae gather light energy through photosynthesis. They include many single-celled creatures that are also considered protozoa, such as Euglena and Paramecium bursaria, which have acquired chloroplasts through secondary endosymbiosis. Others are non-motile, and some are truly multicellular, including some members of the following groups:\n\nChlorophytes green algae, related to higher plants e.g., Ulva \nRhodophytes red algae e.g., Porphyra \nHeterokontophytes brown algae, diatoms, etc. e.g., Macrocystis \n\nThe green and red algae, along with a small group called the glaucophytes, appear to be close relatives of other plants, and so some authors treat them as Plantae despite their simple organization. Most other types of algae, however, developed separately. They include the haptophytes, cryptomonads, dinoflagellates, euglenids, and chlorarachniophytes, all of which have also been considered protozoans.\n\nFungus-like protists\nVarious organisms originally considered fungi were later moved to the Protista. These include the Chytridiomycetes, slime moulds, water moulds, and Labyrinthulomycetes. The chytrids are now known to be related to the other Fungi, and are usually classified with them; the others are now placed among the Amoebozoa and heterokonts.\n\nThe classification of protists is still changing. Newer classification criteria attempt to present monophyletic groups based on ultrastructure, biochemistry, and genetics. Because the protists are paraphyletic, such systems often split up or abandon the Kingdom. A partial picture is given by the list of phyla at right; other groups are listed under the traditional categories, linked to above. For more discussion of modern relationships, see eukaryote or articles referenced below
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That question would require an essay to answer fully.\n\nSome protists, such as kelp, are get energy by photosynthesis.\n\nSome protists, such as Amoeba, get energy by endocytosis.\n\nSome protists, such as Entomoeba, gete energy by direst absorption.\n\nAnd so on and so forth. There are hundreds of thousands of species of protists and they use every conceivable method of obtaining energy.
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Nothing if the protozoans are marine. If they are fresh water protozoans they will loose their water inside their membranes and implode by osmotic pressure and the membrane will rupture. BAD DAY!!
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The domain would be Eukarya--Eukaryotic cells. Some folks would put protista in Kingdom Protista within the larger superkingdom or domain Eukarya. \n\nHowever, the word "protist" conveys the meaning of "eukaryote that isn't a plant, animal, or fungus." It includes "simpler" forms:   no complex development from embryos, no extensive cell differentiation, etc.\nBut, recent studies of protist DNA and ultrastructure show that they are not monophyletic.  The protists are quite diverse and  probably should be classified in several kingdom-level taxa. \nIn other words, the "Kingdom Protista" really represents more than one group.  It contains organisms which are more closely related to members of other kingdoms than they are to other protists.
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Medically speaking, Rhodosporidium is of ophthalmological importance.\n\nEcologically, it's a high grade decomposer.
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I would imagine something in the microbe department. Like a paramecium or ameba.
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Unicellular organisms are placed in both Monera and Protista.  Also there are Archaeans that are single celled prokaryotes that are not placed in either Monera or Protista and are given their own domain called Domain Archaea.  \n\nFor the old classification system unicellular organisms are broadly placed into Monera if they lack a nucleus.  Unicellular organisms are lumped into protista if they have a nucleus and membrane bound organelles, such as mitochodria, and in some cases chloroplasts.  \n\nFor example a bacterium does not possess a nucleus.  Therefore all bacteria are placed into Monera.  \nProtista contains many different kinds of unicellular organisms such as amoeba and green algae.  All of the protists will have a nucleus and mitochondria at the very least.
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The Economic Importance of Bacteria\n Bacteria affect the lives of the average man in countless ways. They may be pathogens, such as these Clostridium tetani. These bacilli are the pathogens responsible for causing tetanus in humans. \n Other organisms may serve as vectors to spread bacteria. Flies, cockroaches, biting insects, rodents and other animals get a lot of the blame for transmitting diseases to humans. But if the truth be told, you're in a lot more danger of contracting somethign dangerous from personal contact with your fellow Homo sapiens than you are from being licked by a fly (or your dog!). \n Nitrogen-fixing bacteria (such as these Rhizobiumsp.) inhabit the root cells of plants in the legume family (Fabaceae). These moneran symbionts convert gaseous nitrogen from the atmosphere (N2) into usable "fixed" nitrogen (ammonia, nitrite and nitrate) which can be absorbed by the roots and used by the plant to manufacture protein and nucleic acids. \n Other bacteria, such as these Streptomyces spp., are sources of life-saving medicines. This genus yields the powerful antibiotic known as streptomycin. Actinomycetes are the source of actinomycin.
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OK, I want to start by saying that Blackwinterbyrd's answer is entirely correct if applying your question to humans, I am being pedantic and taking unicellular organisms into consideration.\n\nIn prokaryotic organisms there is no evolutionary benefit to an apoptotic response as although many prokaryotes live in colonys they are essentialy single cell organisms.  As such many prokaryotes will attempt to cary on with an incomplete copy of their DNA. \nThe most likely outcome of this is that cell will die very quickly however if the DNA synthesis was very nearly complete then it is possiable that cell may survive.
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Mitochondria are cell organelles in the protoplasm, responsible for providing the cell with energy. Due to its function, a mitochondrion is called the 'powerhouse of the cell'.
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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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There are organisms in the kingdom protista that are unicellular and have no cell wall.  The only other kingdom containing organisms without a  cell wall is the animal kingdom.  I am unaware of any animal whose total body contains only 2 cells.\nIt would have to be any animal.