Lab 5 - Protista -Student

Lab 5 - Protista -Student - BSC2011 Lab 5 Protista The term...

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1 The term “protista” refers to all eukaryotes that are not fungi, plants and animals (see taxa marked with yellow boxes in diagram to left). Thus, the protista do not represent a monophyletic group . Like prokaryotes, protists are generally unicellular. Unlike prokaryotes, protists and other eukaryotes possess membrane-bound organelles, membrane-bound nuclei containing their genome, and additional compartmentalization by internal membranes. Protists are an extremely diverse, important group of organisms. They form the basis of many aquatic and terrestrial ecosystems, and cause many debilitating human diseases, such as malaria, sleeping sickness and Chagas disease. Like prokaryotes, protists can be categorized according to how they obtain energy; some protists are photoautotrophic (the so-called “algae”) and others are heterotrophic (the so-called “protozoans”). These categories are not mutually exclusive and some groups use both approaches to obtain energy. Protists also can be classified according to their mode of locomotion. Some protists move around their environment using flagella , long cellular appendage(s) specialized for locomotion. They are commonly known as flagellates. Flagellates occur within the clade Euglenozoa and are characterized by an anterior pocket, from which one or two flagella emerge. Euglena , the genus representative of most flagellates, is mainly photoautotrophic, which is evident by the presence of chloroplasts (green organelles found in photosynthetic plants and protists) within the cells.
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Lab 5 - Protista -Student - BSC2011 Lab 5 Protista The term...

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