BIO152H5 Study Guide - Final Guide: Cambrian Explosion, Phanerozoic, Cellular Respiration
Document Summary
Bio 152 fall 2014 final exam study guide: chapter 25. The geologic record: divided into the archaean, proterozoic, and phanerozoic eons, phanerozoic: Divided into three eras: paleozoic, mesozoic, cenozoic. 550: boundaries between geological divisions correspond to extinction events in the fossil record. Photosynthesis and the oxygen revolution: oldest known fossils called stromatolites: Rocks formed by accumulation of sedimentary layers of bacterial mats. Prokaryotes were earth"s sole inhabitants from 3. 5 to 2. 1 billion years ago: most atmospheric oxygen is of biological origin: Produced by oxygenic photosynthesis reacted with dissolved iron and precipitated out to form banded iron formations. Early rise of it likely to ancient cyanobacteria. 2. 7 to 2. 3 billion years ago o2 began accumulating in atmosphere and terrestrial rocks. The oxygen revolution caused extinction of many prokaryotes. Some groups survived using cellular respiration and adapted it to produce energy. Later increases in rise of o2 caused by evolution of eukaryotic cells containing chloroplasts.
