BIO 105 Lecture 5: Protists

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Protists -- all eukaryotes that are not land plants, fungi, or animals. Extremely diverse and have no traits that are unique to protists (not in any other organisms) Play a key role in aquatic food chain. Many species of unicellular photosynthetic protists are among the leading primary producers in the oceans. Plankton -- basis of the food chain in aquatic environments. Protists do not share a set of derived traits that set them apart from all lineages of the tree of life. Share the basic characteristics of all eukaryotes (mitochondria, nucleus, endomembrane system (organelles with membrane), and cytoskeleton (skeleton for cell)) However, even these basic structural components vary greatly from one group to the next. Endosymbiotic theory -- how eukaryotes came to be. Bacteria developed a way to create and store atp. Ingested by big bacteria didn"t break down, so instead made a vesicle for the small bacteria kept making atp that the big bacteria could use.

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