BIOL 211 Lecture Notes - Lecture 4: Diatom, Red Tide, Diatomaceous Earth
21 Sep 2017
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Cyanobacteria- pond moss, photoautotrophs, produces oxygen during photosynthesis, single celled and colonial species. Anabaena- independent organisim, carries out photosynthesis, fixes nitrogen to a biologically useful form. Nostoc- genus of cyanobacteria, population explosions can turn lakes green. Microsystin- toxic to humans, produced by cyanobacteria during blooms and can contaminate drinking water. A(cid:374)a(cid:271)ae(cid:374)a a(cid:374)d nosto(cid:272) were respo(cid:374)si(cid:271)le for (cid:862)polluti(cid:374)g(cid:863) the earth"s at(cid:373)osphere with o(cid:454)(cid:455)ge(cid:374) 2. 2 billion years ago, this would have killed many other organisims or driven them into anaerobic habitats. The protists- diverse assemblage of eukaryotes that aren"t fu(cid:374)gi, pla(cid:374)ts, or a(cid:374)i(cid:373)als. Base of many food chains, especially in aquatic settings. Eukaryotic cells have dna in 2 or 3 distinct organelles (nucleus & mitochondria & plastics in photosynthetic species) Origin of organelles- ancestors of eukaryotic cells were symbiotic prokaryotic cells (endosymbiont theory) 27. 7 in text. Mitochondira are the desendants of ancient aerobic chemoorganoheterotrophic bacteria. Plastids- descendants of ancient photosynthetic bacteria, very likely cyanobacteria.
