Biology 1002B Lecture Notes - Lecture 2: Ammonia, Rna, Thymine

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Document Summary

Earliest forms of like 4 billion years ago. We don"t have fossils of microbes, so hard to get fossil, hard evidence. Bio signatures are evidence of geology- banded iron, biological source of rapid increase in oxygen because it leads to different oxidation states of iron. Stromatolites- geological structures that have age , microbrial activity produces this formation, bio signatures not direct evidence of life but evidence from geology. Abiotic synthesis - if life has nucleic acids, lipids, proteins in membrane etc. then these primordial molecules must have been formed outside of living things by chemistry. Heritable information- if cell cant divide to make daughter cells and carry on. Metabolism - ability to being energy from outside. Geophysical stage- what was the composition of the earth and atmosphere- we know a lot about this. Can you make amino acids by cooking in the lab. But have lots of source of elections from h2, nh3, ch4, h20.

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