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Protists
Protists are unicellular or multicellular microorganisms. The majority of protists are responsible for many diseases in humans.
1,262 Questions
What is the main problem with classifying protists?
Historical classifications
The first division of the protists from other organisms came in the 1830s, when the German biologist Georg August Goldfuss introduced the word protozoa to refer to organisms such as ciliates and corals.[4] This group was expanded in 1845 to include all "unicellular animals", such as Foraminifera and amoebae. The formal taxonomic category Protoctista was first proposed in the early 1860s by John Hogg, who argued that the protists should include what he saw as primitive unicellular forms of both plants and animals. He defined the Protoctista as a "fourth kingdom of nature", in addition to the then-traditional kingdoms of plants, animals and minerals.[4] The kingdom of minerals was later removed from taxonomy by Ernst Haeckel, leaving plants, animals, and the protists as a "kingdom of primitive forms".[5]
Herbert Copeland resurrected Hogg's label almost a century later, arguing that "Protoctista" literally meant "first established beings", Copeland complained that Haeckel's term protista included anucleated microbes such as bacteria. Copeland's use of the term protoctista did not. In contrast, Copeland's term included nucleated eukaryotes such as diatoms, green algae and fungi.[6] This classification was the basis for Whittaker's later definition of Fungi, Animalia, Plantae and Protista as the four kingdoms of life.[7] The kingdom Protista was later modified to separate prokaryotes into the separate kingdom of Monera, leaving the protists as a group of eukaryotic microorganisms.[8] These five kingdoms remained the accepted classification until the development of molecular phylogenetics in the late 20th century, when it became apparent that neither protists nor monera were single groups of related organisms (they were not monophyletic groups).[9]
Modern classificationsCurrently, the term protist is used to refer to unicellular eukaryotes that either exist as independent cells, or if they occur in colonies, do not show differentiation into tissues.[10] The term protozoa is used to refer to heterotrophic species of protists that do not form filaments. These terms are not used in current taxonomy, and are retained only as convenient ways to refer to these organisms.The taxonomy of protists is still changing. Newer classifications attempt to present monophyletic groups based on ultrastructure, biochemistry, and genetics. Because the protists as a whole are paraphyletic, such systems often split up or abandon the kingdom, instead treating the protist groups as separate lines of eukaryotes. The recent scheme by Adl et al. (2005)[10] is an example that does not bother with formal ranks (phylum, class, etc.) and instead lists organisms in hierarchical lists. This is intended to make the classification more stable in the long term and easier to update. Some of the main groups of protists, which may be treated as phyla, are listed in the taxobox at right.[11] Many are thought to be monophyletic, though there is still uncertainty. For instance, the excavates are probably not monophyletic and the chromalveolates are probably only monophyletic if the haptophytes and cryptomonads are excluded.
What is the difference between an amoeba and a hydra?
Amoebas are single-celled organisms that move by extending their cell membrane called pseudopods, while hydras are multicellular organisms that belong to the phylum Cnidaria and have tentacles around their mouths for feeding. Amoebas lack specialized tissues and organs, while hydras have a simple body structure with a basic nervous system, digestive system, and reproductive organs.
Why protista is consider rag bag of living organisms?
Protists are considered a rag bag of living organisms because they are a diverse group of eukaryotic organisms that do not fit neatly into other major classification groups like plants, animals, or fungi. They exhibit a wide range of characteristics and lifestyles, making them a varied and eclectic group.
How amoeba takes up food describe process with diagram?
The mode of nutrition in amoeba is holozoic. The process of obtaining food is called phagocytosis. Amoeba feeds on microscopic organisms floating on water. The nutrition involves processes like ingestion, digestion, assimilation and egestion.
Process : Amoeba forms pseudopodia to take food. When the tips of
What household items contain diatom?
Diatomaceous earth (diatom) can be found in various household items such as insecticides, toothpaste, water filters, and absorbent materials. It is commonly used for its abrasive and absorbent properties in these products.
What kind of algae is in ramen noodles?
The algae used in making ramen noodles is called konbu, or kombu. It is a type of edible kelp that is commonly used in Japanese cuisine to add flavor and nutrients to broths and soups. Konbu is rich in vitamins and minerals, making it a healthy addition to the diet.
Which structure of a diatom is rich in silicon?
The cell wall of a diatom is rich in silicon. It is composed of two overlapping halves, like a petri dish, made of silica that give diatoms their unique intricate patterns and shapes.
Trypanosomes are a type of parasitic protozoa that can cause diseases in humans and animals, such as sleeping sickness in humans and nagana in animals. They are transmitted to their hosts through the bite of infected tsetse flies. Trypanosomes have a unique characteristic of being able to evade the host's immune system by changing their surface proteins.
How may elements does a diatomic molecules have?
we can identify the element having diatomic by finding out the valency of that element.
i think it helps you.
What is one fun fact about protists?
One actual fun fact is that they can conume other organisms for their nutrients, so that means that you are an organism, so that they can consume you! Joking, but they do consum organisms for their nutrients.
Is the Kingdom Protista still used?
The classification of Kingdom Protista is no longer used in modern biological classifications. Organisms that were once classified under Kingdom Protista are now distributed into various other kingdoms based on their evolutionary relationships, such as Kingdoms Plantae, Animalia, Fungi, and others.
Does plasmodium falciparum have flagella?
No, Plasmodium falciparum, the parasite that causes malaria, does not have flagella. It has a specialized organelle called the apical complex, which helps it invade host cells.
Some amoebas are parasitic, meaning they live inside another organism and obtain nutrients at the host's expense. However, not all amoebas are parasitic, as there are many free-living species that feed on bacteria and algae in various environments.
Algae are autotrophs, which means they produce their own food.
What is the term meaning plant-like protists?
A single celled protist that shares characteristics with a plant.
Are diatoms classified as chrysophytes?
Yes, diatoms are classified within the division Chrysophyta, which includes golden-brown algae like diatoms.
What complex structures used for locomotion evolved in protists?
Flagella, Cilia and Cytoplasmic Streaming. Cilia are small hairlike structures that protists use to "crawl". A flagella is a long tail that pushes and propels the protist forward, also used by sperm cells. Cytoplasmic Streaming is used by the amoeba to "ooze" its way to places.
Yes, Blepharisma have cilia. Cilia are hair-like structures that help with movement and feeding in many protists, including Blepharisma. The cilia beat in coordinated patterns to allow the organism to swim and capture food particles.
Can neon tetra live with algae eater?
Yes, neon tetras can live with algae eaters like bristlenose plecos or Siamese algae eaters. However, make sure the tank size is large enough to accommodate both species, and provide ample hiding spots for the neon tetras as they can be sensitive to aggressive tankmates. Additionally, ensure the algae eater's diet is supplemented as they may not rely solely on algae for sustenance.
Is oxygen element monoatomic or diatomic?
Oxygen can either be diatomic, monoatomic and triatomic. The question is which one is the most stable. The most stable is obviously diatomic oxygen O2. Next is triatomic (ozone) O3 and the least stable (very unstable) is monoatomic. Monoatomic oxygen is very shortly living species combining easily (due to very high electronegativity) with large number of elements including another oxygen atom. If we are required to say which is the most common form of oxygen then we need to say it is diatomic O2 existing at room temp and atmospheric pressure as a gas.
What are some animal-like protist?
In a 33 chapter microbiology book, 'The Protists' do not Appear until Chapter Number 26!
They include five types of Algae, four types of Protozoa, one yeast and six fungi and The Slime Molds.
What are the three main sub-classificationor types of protists?
The three main sub-classifications of protists are protozoa (unicellular organisms that obtain nutrients through ingestion), algae (photosynthetic organisms that can be unicellular or multicellular), and fungus-like protists (heterotrophic organisms with characteristics similar to fungi).
No, blepharisma is not an algae. It is a type of unicellular ciliate protozoan that is classified in the phylum Ciliophora. Algae are photosynthetic organisms that belong to a different biological kingdom.
Are organisms in kingdom protista capable of producing their own food?
Some organisms in the kingdom Protista are capable of producing their own food through photosynthesis, like algae. However, not all protists have this ability, as some are heterotrophic and need to obtain nutrients from other sources.
