LIFE 121 Lecture Notes - Lecture 7: Archean, Prokaryote, Organelle
Document Summary
2. 7 bya: 3 stages in diversification of eukaryotes. Endosymbiont- cell that lives within another cell (host) Atmosphere increasing (o2) due primarily to increase # cyanobacteria: two types of cells present. Small, heterotrophic, single-cell bacteria able to produce large amounts of energy via aerobic (o2 requiring) respiration. Larger, heterotrophic, single-cell eukaryotic unable to produce large amounts of. Larger, anaerobic eukaryotic cells engulf the small, aerobic bacteria: endosymbiotic theory of the chloroplast (484) Endosymbiotic origin of chloroplasts in algae: endosymbiosis: process which certain unicellular organisms engulf other cells, which become. Endosymbiont and ultimately organelles in the host cell: evidence indicates that later in eukaryotic history a lineage of heterotrophic eukaryotes acquired a photosynthetic cyanobacterium that then evolved into plastids. Ex/ protists known as eugleonoids likely evolved when a heterotrophic eukaryote engulfed a green alga. Green algae: includes chlorophytes and charophytes: chlorophytes freshwater and marine. Phragmoplast: an alignment of spindle microtubules and golgi derived vesicles that forms across midline of dividing cells.
