Ch 12-2 Bilogy

Chapter 12 Section 2: The ontogenesis of Cellular life story The Evolution of Prokaryotes * Fossil- preserved or mineralized remains or depression 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 mobile phone walls and numerous a(prenominal) cause complaint/decay. * Archaebacteria-prokaryotes that lack peptidoglycan in cell walls and bewilder unique lipids in membranes. The Evolution of Eukaryotes * First eukaryotes appeared ab exhibit 1.5 billion years ago. The Origins of Mitochondria and Chloroplasts * more than or less biologists conceive of that they (^^) originated from theory of endosymbosis- mitochondria> descendants of symbiotic, aerobic eubacteria; chloroplasts> descendants of symbiotic, photosynthetic eubacteria. * Thought that bac teria entered large prokaryote and lived in cell either through cellular resp. or photosyn. * as rise as similar: * Size and structure * Genetic satisfying * 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 perceptible with naked eye is multicellular (700 one cardinal million years old) * Not all multicellular lines produce divers(prenominal) organisms. * From these protists sprung 3 other kingdom! sFungi, Plantae, and Animalia. Origins of Modern Organisms * Cambrian period was a period of great evolutionary expansion. * The Ordovician period, followed Cambrian resulted in many more animals in the seas. cumulation 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: OrderEssay.net

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