Unformatted text preview: ° This early atmosphere had mildly reducing conditions ° As the earth cooled, H 2 0 dropped from the sky, and the oceans formed. These early oceans contained lots of sulfates and acids. • Some scenarios for the origin of life: o The Miller Urey experiment: CH 4 , H 2 , NH 4 , and H 2 O, plus energy, will generate amino acids and simple sugars. o But how do you produce molecules that actually replicate? ° Slide: ribosomal RNA – its folding, tertiary structure allows it to act as an enzyme: ribozyme. ° Thus we have a single molecule that can reproduce itself and act as an enzyme, and hence this might be where life originated ° There’s also a clay that can create lipids, and once one of these ribozymes ended up inside one of these lipid vesicles, very interesting things could happen. ° However, there are some problems – we don’t really know – this is all speculative....
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- Fall '09
- Bacteria, early earth, Abiogenesis, Panspermia