BLG 144 Lecture Notes - Lecture 7: Phytophthora Infestans, Symbiogenesis, Red Algae
Document Summary
Domain eukarya key features: have nuclear envelope, complex organelles, multicellular organisms, most sexually reproduce. Protists belong to the kingdom protista part of the domain eukarya. Protists are not a monophyletic clade > fungi, animals, and land plants are not protists. Often unicellular mixotrophs: protists that can switch between heterotroph and phototroph. 1. malaria: crop failure (potato blight, parasitic fungus-like protist, harmful algae blooms: produce toxins, ecological importance, food chains/webs, primary producers ultimate source of energy. Synapomorphies: shared derived traits from a common ancestor. Infolding hypothesis: plasma membrane folds creating er and nuclear envelope, folds over time and detach. Separates genome transcription and translation by forming ^ (controls gene expression) Endosymbiosis theory: an aerobic bacterium was engulfed which provided lots of atp for the cell and in return got carbon compounds. Double membrane of mitochondria > evidence of engulfment. Mitochondrion have their own genome, phylogeny of mitochondrial dna is much closer to proteobacteria than eukaryotes.