BIO1011 Study Guide - Quiz Guide: Symbiogenesis, Green Algae, Golden Algae
3 Aug 2018
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First arose in cyanobacteria 3. 5bya as seen by fossil evidence. Photosynthesis freed organisms from a reliance on consuming organic compounds. Waste product of photosynthesis: o2: cha(cid:374)ged the earth"s at(cid:373)osphere. A relationship between two species in which one organism lives inside the cells of another. First event of endosymbiosis was archaeplastids engulfing cyanobacteria. This then gave rise to two evolutionary lineages: algae (red and green) and glaucophytes. Only one endosymbiosis event occurred between cyanobacteria and the ancestors of land plants. Red algae was engulfed to form dinoflagellates and stramenopiles. Green algae was also engulfed, to form euglenozoans and chlorarachniophytes. Euglenozoans are photosynthetic from secondary endosymbiosis of green algae. Consist of diatoms (20% of photosynthesis), golden algae and brown algae. Consist of dinoflagellates (photosynthetic, red algae endosymbiosis) and apicomplexans, separate lineage ciliates. Contain red algae, green algae (chlorophytes and charophytes) and land plants. Green algae and land plants are known as viridiophytes. Cellulose is synthesised by protein rosettes in both.
