Ch 12-2 Bilogy

Chapter 12 Section 2: The ontogenesis of Cellular sustenance The Evolution of Prokaryotes * Fossil- preserved or mineralized remains or yarn-dye of beingness that lived long ago. * Cyanobacteria- photosynthetic prokaryotes that produced oxygen into ocean and onto atmosphere. twain Groups of Prokaryotes * true bacteria (bacteria) - prokaryotes that contain petidoglycan in cubicle walls and umteen a(prenominal) cause complaint/decay. * Archaebacteria-prokaryotes that lack peptidoglycan in cell walls and stand unique lipids in membranes. The Evolution of Eukaryotes * First eukaryotes appeared ab notice 1.5 billion years ago. The Origins of Mitochondria and Chloroplasts * much than or less biologists estimate that they (^^) originated from theory of endosymbosis- mitochondria> descendants of symbiotic, aerobic eubacteria; chloroplasts> descendants of symbiotic, photosynthetic eubacteria. * Thought that bacteria entered larg e prokaryote and lived in cell either through cellular resp. or photosyn. * as intimately as similar: * Size and structure * Genetic temporal * Ribosomes * Reproduction Multicellularity * Protists- make up large, alter group that includes twain multicellular and unicellular organisms (eukaryotes).

* Multicellularity has many advantages over unicellularity because multicell organisms have more than one cell to carry out activities. * Mostly anything unmistakable with naked eye is multicellular (700 one million million years old) * Not all mul ticellular lines produce divers(prenominal)! organisms. * From these protists sprung 3 other kingdomsFungi, Plantae, and Animalia. Origins of Modern Organisms * Cambrian period was a clock of great evolutionary expansion. * The Ordovician period, followed Cambrian resulted in many more animals in the seas. commode Extinctions * Extinction- death of all members of a species. * Mass out(p)ion- episode during which large numbers of species become extinct (5) * 440, 360, 245, 210, 65 million...If you want to get a full essay, piece it on our website: OrderCustomPaper.com

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