Ch 12-2 Bilogy

Chapter 12 Section 2: The ontogenesis of Cellular sprightliness The Evolution of Prokaryotes * Fossil- preserved or mineralized remains or act upon of beingness that lived long ago. * Cyanobacteria- photosynthetic prokaryotes that produced oxygen into ocean and onto atmosphere. dickens Groups of Prokaryotes * true bacteria (bacteria) - prokaryotes that contain petidoglycan in cadre walls and many an(prenominal) a(prenominal) cause complaint/decay. * Archaebacteria-prokaryotes that lack peptidoglycan in cell walls and get unique lipids in membranes. The Evolution of Eukaryotes * First eukaryotes appeared ab put out 1.5 billion years ago. The Origins of Mitochondria and Chloroplasts * much or less biologists conjecture that they (^^) originated from theory of endosymbosis- mitochondria> descendants of symbiotic, aerobic eubacteria; chloroplasts> descendants of symbiotic, photosynthetic eubacteria. * Thought that bacteria en tered large prokaryote and lived in cell either through cellular resp. or photosyn. * as well up as similar: * Size and structure * Genetic tangible * Ribosomes * Reproduction Multicellularity * Protists- make up large, alter group that includes both multicellular and unicellular organisms (eukaryotes).

* Multicellularity has many advantages over unicellularity because multicell organisms have more(prenominal) than one cell to carry out activities. * Mostly anything obvious with naked eye is multicellular (700 one one thousand thousand million yea rs old) * Not all multicellular lines p! roduce divers(prenominal) organisms. * From these protists sprung 3 other kingdomsFungi, Plantae, and Animalia. Origins of Modern Organisms * Cambrian period was a cartridge holder of great evolutionary expansion. * The Ordovician period, followed Cambrian resulted in many more animals in the seas. trade 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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