BIOL 1202 Lecture Notes - Lecture 5: Issf 10 Meter Air Rifle, Autotroph, Carl Linnaeus
Document Summary
Concept (cid:1006)5. (cid:1007): key events in life"s history include the origins of single-celled and multi-celled organisms and the colonization of land. What were the earliest organisms like: first organisms were prokaryotes. Fed on accumulated organic molecules (heterotrophic) some were likely autotrophic. Oxygenic photosynthetic bacteria evolved between 3. 5 and 2. 7 bya: co2+h2o food+ o2, oxygen begins accumulating in the atmosphere 2. 7 bya, figure 25. 8. The first eukaryotes: oldest fossils of eukaryotic cells are 2. 1 by old, endosymbiotic theory. Mitochondria and plastids were formerly small prokaryotes living within larger host cells. Were possibly undigested prey or internal parasites or mutualists: figure 25. 9. Both chloroplasts and mitochondria contain dna that is distinct from that found in the nucleus of the eukaryotic cell. Both chloroplasts and mitochondria have their own ribosomes and make proteins independent from the cell. Clock analogy: shows time scales involved in the history of life on earth, figure 26. 10. Chapter 26 phylogeny and the tree of life.
