01:119:115 Chapter Notes - Chapter 25: Hydrogen Sulfide, Protocell, Radiometric Dating
28 Mar 2016
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The 4 requirements for chemical evoluion to have occurred: condiions of early earth. Litle or no free oxygen: oxygen oxidizes: breaks bonds. Atmosphere was low in free o (any o would have been ied up in compounds) The 4 steps hypothesis of single cell formaion: abioic synthesis small organic molecules formed spontaneously. Packaging into: protocells droplets with membranes that could maintain int env diferent from surroundings, origin of self-replicaion molecules. Thursday, september 11, 2014: 1st step: formaion of small organic molecules, how could this have happened, two main models which try to explain. In lab, drip soluion of amino acids onto hot rock join to form polypepide: formaion of protocells, aggregate of abioically produced (not by organisms) organic polymers exhibit many atributes of living cells, ex. Microsphere: protocell formed by adding water to polypepides and have some characterisics of living cells: Produce electrical potenial across surface like gradients across cell membranes. Absorb materials and undergo osmoic swelling and shrinking.
