BIOL 172 Lecture Notes - Lecture 2: African Trypanosomiasis, Heterokont, Laminaria
Document Summary
How monophyly was determined: based on molecular evidence. Base of food chain in aquatic environment. Economically significant b/c they cause a red tide in ocean. When overpopulated, all of its toxins come together and kill other aquatic species. Host cannot develop immunity b/c continual change of surface protein of cell. African sleeping sickness has this same problem. Cilia: short hairs that cover entirety of cell. Has animal life cycle b/c of convergent evolution. Kelp: plant-like structures that can be found on brown algae. Alginate: unique chemical component of the cell wall in brown algae. Rhizaria: closely related to the stramenopile and alveolate clades. Most members in this group have an amoeba stage. But is not indication of monophyly b/c species from other unrelated taxa have amoeba stage. Type of pseudopodia present in amoebae of rhizaria: filose pseudopodia in forams, cercozoans, and radiolarians. Evolved as a result of secondary endosymbiosis. Have nucleomorph, nuclei found btwn inner and outer membranes.
