BLG 144 Lecture Notes - Lecture 5: Paleozoic, Cellular Respiration, Doushantuo Formation
Document Summary
Harsh b/c volcanic eruptions = release toxic compounds. Energy came from lightening + uv radiation. Ocean = primitive soup = nutritious with organic molecules. Molecules came from volcanoes + sea vents + meteors (rich in a. as used for atp synthesis) 3 eons - archean + proterozoic = precambrian. Phanerozoic (recent) has 3 eras = paleozoic, mesozoic and cenozoic ended with mass extinction. Stromatolites oldest known fossils; bacteria + sediments + autotrophs make their own food. Early photosynthesis but didn"t free o2 b/c it saturated in the ocean. O2 revolution = doomed anaerobic prokaryotes but gave rise to cellular respiration. Mitochondria and plastics such as chloroplasts in cell came from the process of endosymbiosis eukaryotic orgs engulf bacteria for energy and becomes part of the cell and provides energy via o2 (electron acceptor in cellular respiration) End of proterozoic era world of small, soft, squishy animals. There was distinct faunas collections of animals with distinct forms.
