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Eukaryotic microorganisms
- Protists defy convention. They are eukaryotic microorganisms (containing a cell nucleus) which are not an animal, plant, or fungus. Yet almost all life depends on protists and their critical position; holding-up the bottom of our food chains. Protists, along with bacteria and fungi, produce most of the oxygen on our planet through photosynthesis.
www.earlham.ac.uk › articles › biodiversity-outsiders-protist-gangThe biodiversity ‘outsiders’ - the protist gang | Earlham ...
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Are protist cells unicellular or multicellular?
What characteristics are common to all protists?
Are all protists microscopic?
Why are protist cells so complex?
- Evolutionary Relationships. In the phylogenetic tree above (Figure \\(\\PageIndex{1}\\)), protists do not share a common ancestry. Slime molds share a more recent evolutionary history with fungi and animals, while red and green algae are more closely related to land plants than they are to the brown algae (located in the Stramenopiles group).
- Cell Structure. The cells of protists are among the most elaborate of all cells. Most protists are microscopic and unicellular, but some true multicellular forms exist (such as in the brown algae, Phaeophyta).
- Metabolism. Protists exhibit many forms of nutrition and may be aerobic or anaerobic. Protists that store energy by photosynthesis belong to a group of photoautotrophs and are characterized by the presence of chloroplasts.
- Motility. The majority of protists are motile, but different types of protists have evolved varied modes of movement (Figure \\(\\PageIndex{3}\\)). Some protists have one or more flagella, which they rotate or whip.
Jun 11, 2021 · To put the vast entity of protist microbial communities in perspective - our oceans contain 100 million times more bacteria than the number of stars in the universe - and a single teaspoon of soil is home to as many microorganisms as the population of the entire Afrcian continent. They may be tiny but still undeniably important.
Not all protists are microscopic. Some have huge, macroscopic cells, such as the plasmodia (giant amoebae) of myxomycete slime molds or the marine green alga Caulerpa, which can have single cells that can be several meters in size. Some protists are multicellular, such as the red, green, and brown seaweeds.
Most protists are microscopic and unicellular, but some true multicellular forms exist. A few protists live as colonies that behave in some ways as a group of free-living cells and in other ways as a multicellular organism.
Sep 22, 2021 · Protist Structure. The cells of protists are among the most elaborate of all cells. Most protists are microscopic and unicellular, but some true multicellular forms exist. A few protists live as colonies that behave in some ways as a group of free-living cells and in other ways as a multicellular organism.
Describe the cell structure characteristics of protists. Describe the metabolic diversity of protists. Describe the life cycle diversity of protists. There are over 100,000 described living species of protists, and it is unclear how many undescribed species may exist.
Because the name “protist” serves as a catchall term for eukaryotic organisms that are not animal, plant, or fungi, it is not surprising that very few characteristics are common to all protists. On the other hand, familiar characteristics of plants and animals are foreshadowed in various protists.
