Protist4 - Protista Euglenoids The Euglenoids are the least...

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Protista Euglenoids The Euglenoids are the least algae-like of the algae. They are unicellular and motile, and they lack a key plant-like structure: the cell wall. For these reasons, they are often categorized as protests. Most euglenoids are photosynthetic, but some lack chlorophyll and are heterotrophic (requiring complex organic compounds of nitrogen and carbon for metabolic synthesis). The structure of a typical euglenoid, Euglena is pictured below. Figure %: Structure of Euglena The euglena has several organelles typical of eukaryotes. The chloroplasts of the Euglena are surrounded by three membranes, indicating that they are the result of endosymbiosis of a eukaryote, most likely a green algal cell . Euglena also have a light sensitive stigma which allows
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them to move toward light sources for better photosynthesis. The two flagella found in the anterior invagination are not the same as the flagella found in prokaryotes . gives a comparison of the structures of eukaryotic and prokaryotic flagella. The flagella of
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