BI236 Lecture Notes - Lecture 2: Endoplasmic Reticulum, Commensalism, Phylogenetics
Document Summary
Bi256: unicellular eukaryotes: protozoan groups (ch11); part i. Locomotion: characteristics and backgound, nutrition, osmoregulation, sex (or not, diversity. Protozoans: ~ 250,000 protozoan species, protozoans defy tidy classification, plant-animal distinction not easily made, despite apparent simplicity, protozoans are as complex as any metazoan, few other groups rival protozoans in economic importance. Have at least one motile stage in life cycle. Many lifestyles (free living, symbiotic: mutualistic, commensalistic, parasitic) All types of nutrition: autotrophic, but most heterotrophic. Reproduction asexually by fission, budding and cysts or sexually by conjugation. Recently shown that there are at least seven or more phyla. May be more than 60 exclusive eukaryotic clades (cid:862)protozoa . Now used informally without implying phyletic relationship. Nutrition: mode of nutrition - often variable and opportunistic, autotrophic. Undulipodia: cilia - propel water parallel to the cell surface, flagella - propel water parallel to the flagellum axis. Structurally and functionally almost identical - flagella longer.
