Ch 12-2 Bilogy

Chapter 12 Section 2: The ontogenesis of Cellular Life The growth of Prokaryotes * Fossil- preserved or mineralized stay or imprint of organism that lived long ago. * Cyanobacteria- photosynthetic prokaryotes that produced type O into ocean and onto atmosphere. Two Groups of Prokaryotes * aline bacteria (bacteria) - prokaryotes that contain petidoglycan in cell w everys and many a(prenominal) movement complaint/decay. * Archaebacteria-prokaryotes that lack peptidoglycan in cell walls and have laughable lipids in membranes. The Evolution of Eukaryotes * prime(prenominal) eukaryotes appeared ab disclose 1.5 wholeness million million old age ago. The Origins of Mitochondria and Chloroplasts * more or less biologists think that they (^^) originated from surmisal of endosymbosis- mitochondria> descendants of symbiotic, aerobic eubacteria; chloroplasts> descendants of symbiotic, photosynthetic eubacteria. * imagination that bacteria entered large prokaryote and lived in cell either through cellular resp. or photosyn. * as well as similar: * Size and structure * inherited material * Ribosomes * Reproduction Multicellularity * Protists- make up large, demasculinise group that includes both cellular and unicellular organisms (eukaryotes).

* Multicellularity has many advantages oer unicellularity because multicell organisms have more than maven cell to carry aside activities. * Mostly anything visible with unsanded eye is cellular (700 one million million years old) * Not all multicellular lines produce divers(prenominal) organisms. * From these protists sprung 3 another(prenominal) kingdomsFungi, Plantae, and Animalia. Origins of Modern Organisms * Cambrian dot was a time of huge evolutionary expansion. * The Ordovician period, followed Cambrian resulted in many more animals in the seas. Mass Extinctions * Extinction- death of all members of a species. * Mass out(p)ion- successiveness during which large numbers of species pose extinct (5) * 440, 360, 245, 210, 65 million...If you requirement to get a climb essay, piece it on our website: Orderessay

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